Name: Scalloped Onions Recipe
Ingredients: Cooking Spray: This seemingly simple ingredient is the unsung hero of easy cleanup. A light coating of cooking spray in your casserole dish prevents the onions and creamy sauce from sticking, ensuring that every delicious morsel is easily scooped out and that washing up is a breeze. You can use any neutral cooking spray, such as canola oil, vegetable oil, or even olive oil spray. Alternatively, you can lightly grease the dish with butter or oil if you prefer.; 1 Pound Yellow Onions, Peeled and Sliced Thinly: The star of the show! Yellow onions are the ideal choice for scalloped onions due to their balanced flavor profile. They offer a pleasant sharpness when raw, but as they cook, they mellow beautifully, becoming sweet and deeply flavorful as they caramelize in the oven. The key here is to slice them thinly and uniformly. Thin slices ensure that the onions cook through evenly and become wonderfully tender in the allotted time. A mandoline slicer can be helpful for achieving perfectly thin and consistent slices, but a sharp knife and a little patience will work just as well. If you are sensitive to the sharpness of raw onions, you can soak the sliced onions in cold water for about 10 minutes before using them; this will help to reduce their pungency.; 3 Tablespoons All-Purpose Flour: Flour is the secret to achieving that luxuriously creamy sauce that blankets the onions. When sprinkled between the layers of onions, the flour acts as a thickening agent. As the casserole bakes, the flour will absorb the heavy cream, creating a rich and velvety sauce that perfectly coats each slice of onion. All-purpose flour is the standard choice for this recipe, but you could also use gluten-free all-purpose flour blends if needed.; 2 Tablespoons Butter: Butter adds a layer of richness and flavor that is simply irreplaceable. Dotting the butter between the onion layers not only enhances the overall flavor profile but also helps with browning and caramelization. The butter melts and mingles with the onions and cream, creating a lusciousness that elevates the dish from good to extraordinary. Unsalted butter is recommended so you have better control over the saltiness of the final dish.; 2 Cups Heavy Cream: The heart of the creamy sauce! Heavy cream is essential for achieving the decadent texture that defines scalloped onions. Its high fat content ensures a rich, velvety sauce that clings beautifully to the tender onions. Avoid substituting with milk or half-and-half, as these will result in a thinner sauce that lacks the luxuriousness of heavy cream. If you’re looking to slightly reduce the richness, you could use a combination of heavy cream and whole milk, but for the most authentic and decadent experience, heavy cream is the way to go.; Kosher Salt: Salt is a flavor enhancer that is crucial in any recipe, and scalloped onions are no exception. Kosher salt, with its larger crystals, is preferred by many cooks for its ease of use and consistent seasoning. Salt not only enhances the natural sweetness of the onions but also balances the richness of the cream and butter, creating a harmonious flavor profile. Season each layer of onions generously with kosher salt to ensure that the entire dish is well-seasoned.; Pepper, Both to Taste: A touch of pepper adds a subtle warmth and complexity to the scalloped onions. Freshly ground black pepper is highly recommended for its vibrant flavor. You can also experiment with white pepper for a milder, more subtle peppery note. Season each layer of onions with pepper, and then add more to taste at the end if desired. Don’t be shy with the pepper; it complements the sweetness of the onions and the richness of the cream beautifully.

Ingredients

Scale

Cooking Spray: This seemingly simple ingredient is the unsung hero of easy cleanup. A light coating of cooking spray in your casserole dish prevents the onions and creamy sauce from sticking, ensuring that every delicious morsel is easily scooped out and that washing up is a breeze. You can use any neutral cooking spray, such as canola oil, vegetable oil, or even olive oil spray. Alternatively, you can lightly grease the dish with butter or oil if you prefer.

1 Pound Yellow Onions, Peeled and Sliced Thinly: The star of the show! Yellow onions are the ideal choice for scalloped onions due to their balanced flavor profile. They offer a pleasant sharpness when raw, but as they cook, they mellow beautifully, becoming sweet and deeply flavorful as they caramelize in the oven. The key here is to slice them thinly and uniformly. Thin slices ensure that the onions cook through evenly and become wonderfully tender in the allotted time. A mandoline slicer can be helpful for achieving perfectly thin and consistent slices, but a sharp knife and a little patience will work just as well. If you are sensitive to the sharpness of raw onions, you can soak the sliced onions in cold water for about 10 minutes before using them; this will help to reduce their pungency.

3 Tablespoons All-Purpose Flour: Flour is the secret to achieving that luxuriously creamy sauce that blankets the onions. When sprinkled between the layers of onions, the flour acts as a thickening agent. As the casserole bakes, the flour will absorb the heavy cream, creating a rich and velvety sauce that perfectly coats each slice of onion. All-purpose flour is the standard choice for this recipe, but you could also use gluten-free all-purpose flour blends if needed.

2 Tablespoons Butter: Butter adds a layer of richness and flavor that is simply irreplaceable. Dotting the butter between the onion layers not only enhances the overall flavor profile but also helps with browning and caramelization. The butter melts and mingles with the onions and cream, creating a lusciousness that elevates the dish from good to extraordinary. Unsalted butter is recommended so you have better control over the saltiness of the final dish.

2 Cups Heavy Cream: The heart of the creamy sauce! Heavy cream is essential for achieving the decadent texture that defines scalloped onions. Its high fat content ensures a rich, velvety sauce that clings beautifully to the tender onions. Avoid substituting with milk or half-and-half, as these will result in a thinner sauce that lacks the luxuriousness of heavy cream. If you’re looking to slightly reduce the richness, you could use a combination of heavy cream and whole milk, but for the most authentic and decadent experience, heavy cream is the way to go.

Kosher Salt: Salt is a flavor enhancer that is crucial in any recipe, and scalloped onions are no exception. Kosher salt, with its larger crystals, is preferred by many cooks for its ease of use and consistent seasoning. Salt not only enhances the natural sweetness of the onions but also balances the richness of the cream and butter, creating a harmonious flavor profile. Season each layer of onions generously with kosher salt to ensure that the entire dish is well-seasoned.

Pepper, Both to Taste: A touch of pepper adds a subtle warmth and complexity to the scalloped onions. Freshly ground black pepper is highly recommended for its vibrant flavor. You can also experiment with white pepper for a milder, more subtle peppery note. Season each layer of onions with pepper, and then add more to taste at the end if desired. Don’t be shy with the pepper; it complements the sweetness of the onions and the richness of the cream beautifully.

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Instructions

Preheat Your Oven to 375 Degrees F (190 Degrees C). Convection Setting Recommended: Preheating the oven to the correct temperature is crucial for even cooking and optimal caramelization. 375 degrees F is the sweet spot – hot enough to promote browning and caramelization, but gentle enough to allow the onions to become tender without burning. If your oven has a convection setting, definitely use it! Convection ovens circulate hot air more evenly, resulting in faster and more consistent cooking and browning. If you are using a conventional oven, you may need to add a bit more cooking time to achieve the desired level of caramelization.

Prepare Your Casserole Dish: Spray a 2-quart casserole dish generously with cooking spray. This simple step is essential for preventing sticking and making cleanup a breeze. A 2-quart casserole dish is the perfect size for this recipe, ensuring that the onions are layered nicely and cook evenly. If you don’t have cooking spray, you can grease the dish with butter or oil.

Layer the Onions and Seasonings (First Layer): Begin by layering half of the thinly sliced yellow onions in the bottom of the prepared casserole dish. Spread them out in an even layer to ensure uniform cooking. Next, sprinkle 1 tablespoon of all-purpose flour evenly over the onions. This flour will help to thicken the cream sauce as it bakes. Season generously with kosher salt and freshly ground black pepper. Don’t be afraid to season each layer; this ensures that the flavors are distributed throughout the dish. Finally, dot with 1 tablespoon of butter, distributing small pats of butter evenly over the onion layer. The butter will melt and infuse the onions with rich flavor and help with browning.

Repeat the Layering (Second Layer): Repeat step three with the remaining half of the sliced onions, 1 tablespoon of flour, kosher salt, pepper, and the remaining 1 tablespoon of butter. Layering the onions and seasonings in this way ensures that each layer is properly seasoned and that the flour is distributed throughout the dish, resulting in a creamy sauce throughout.

Pour Heavy Cream Over the Onions: Slowly and evenly pour 2 cups of heavy cream over the layered onions in the casserole dish. Make sure the cream is distributed evenly to cover all the onions. The heavy cream will seep down through the layers as it bakes, creating a luscious and creamy sauce.

Bake to Caramelized Perfection: Place the casserole dish on a baking sheet. This is an important step, especially if your casserole dish is prone to bubbling over. The baking sheet will catch any spills and prevent a messy oven. Bake in the preheated oven for at least 1 hour, and up to 2 hours, or until the onions are tender, deeply caramelized, and the cream sauce is thick and bubbly. The cooking time will vary depending on your oven and the desired level of caramelization. Start checking for doneness at the 1-hour mark. You want the onions to be meltingly tender and deeply golden brown around the edges. The cream sauce should be thickened and slightly caramelized on top.

Rest and Serve: Once the scalloped onions have reached your desired level of caramelization, remove the casserole dish from the oven and let it rest for a few minutes before serving. This allows the sauce to thicken slightly and the flavors to meld together even further. The casserole will hold well on “warm” in your oven for up to 30 minutes if needed, making it a great make-ahead side dish.

Nutrition

Serving Size: One Normal Portion
Calories: 250-350