Part 1: Making the Lemon Raspberry Cupcake Batter

1. Preheat and Prep: Preheat your oven to 350°F (175°C). Line two standard 12-cup muffin tins with paper liners. Set aside.
2. Zest and Juice Lemons: Wash your lemons thoroughly. Zest one large or two small lemons until you have 1 tablespoon of finely grated zest. Avoid grating the white pith, which is bitter. Then, juice the lemons until you have 1/4 cup (for the batter) plus 2-3 tablespoons (for the frosting). Set aside.
3. Prepare Raspberries: Place the 1 ½ cups of fresh or frozen raspberries in a small bowl. Sprinkle the 1 tablespoon of all-purpose flour over them and toss gently to coat. This flour coating helps absorb excess moisture and prevents the berries from sinking straight to the bottom of the batter during baking. If using frozen raspberries, work quickly and do not let them thaw.
4. Combine Wet Ingredients: In a large mixing bowl, combine the cake mix powder (discard any separate pouches unless the box instructions specifically say otherwise regarding additions). Add the buttermilk (or milk), melted butter, eggs, 1/4 cup fresh lemon juice, 1 tablespoon lemon zest, vanilla extract, and the optional lemon extract.
5. Mix the Batter: Using a handheld electric mixer or a stand mixer fitted with the paddle attachment, beat the ingredients on low speed for about 30 seconds just to combine. Scrape down the sides and bottom of the bowl. Increase the speed to medium and beat for 2 minutes, as typically directed on most cake mix boxes. Be careful not to overmix; stop once everything is well combined and smooth. The batter will be relatively thick.
6. Fold in Raspberries: Gently fold the flour-coated raspberries into the batter using a rubber spatula. Mix just until they are evenly distributed. Overmixing at this stage can break the berries and turn your batter pink, and can also develop the gluten too much, leading to tougher cupcakes. A few gentle folds are all you need.

Part 2: Baking the Cupcakes

1. Fill Cupcake Liners: Divide the batter evenly among the prepared 24 cupcake liners. Fill each liner about two-thirds full. Using an ice cream scoop (a standard size works well) can help ensure consistent cupcake sizes. Avoid overfilling, as the cupcakes will rise during baking.
2. Bake: Place the muffin tins in the preheated oven. Bake for 18-22 minutes. Baking time can vary slightly depending on your oven and the specific cake mix used. The cupcakes are done when they are lightly golden brown, spring back when gently touched in the center, and a wooden toothpick inserted into the center of a cupcake (avoiding a raspberry) comes out clean or with just a few moist crumbs attached.
3. Cool: Once baked, carefully remove the muffin tins from the oven. Let the cupcakes cool in the tins for about 5-10 minutes. This allows them to set slightly. Then, carefully transfer the cupcakes from the tins to wire cooling racks. Allow them to cool completely before frosting. This is crucial – frosting warm cupcakes will result in melted, runny frosting. This cooling process can take 1-2 hours at room temperature.

Part 3: Making the Lemon Cream Cheese Frosting

1. Cream Butter and Cream Cheese: In a large bowl using an electric mixer (with the paddle attachment for a stand mixer or beaters for a handheld), beat the softened cream cheese and softened butter together on medium-high speed until smooth, creamy, and well combined. This should take about 2-3 minutes. Scrape down the sides of the bowl occasionally. Ensuring both are properly softened prevents lumps.
2. Add Sugar Gradually: Sift your powdered sugar to remove any lumps. With the mixer on low speed, gradually add the sifted powdered sugar, about one cup at a time, mixing well after each addition. The mixture will become thick.
3. Incorporate Lemon and Vanilla: Add 2 tablespoons of fresh lemon juice, 1 teaspoon of lemon zest, the vanilla extract, and a pinch of salt. Beat on low speed until combined, then increase the speed to medium-high and beat for another 2-3 minutes until the frosting is light, fluffy, and smooth.
4. Adjust Consistency and Flavor: Check the frosting’s consistency and flavor. If it’s too thick for your liking (especially for piping), add the remaining tablespoon of lemon juice or 1-2 tablespoons of milk or cream, one tablespoon at a time, beating until you reach the desired consistency. If you want a stronger lemon flavor, you can add a tiny bit more zest (be careful not to make it bitter) or another splash of lemon juice, keeping in mind this will thin the frosting. If it becomes too thin, add a bit more sifted powdered sugar.

Part 4: Frosting and Garnishing

1. Ensure Cupcakes are Cool: Double-check that your cupcakes are completely cool to the touch.
2. Frost the Cupcakes:

   • Piping: Transfer the frosting to a piping bag fitted with your desired tip (a large star or round tip works well). Pipe a generous swirl onto each cupcake. Start from the outside edge and spiral inwards and upwards.
   • Spreading: Use an offset spatula or a butter knife to spread a layer of frosting evenly over the top of each cupcake. You can create a simple swirl with the back of a spoon or the tip of the spatula for a rustic look.

3. Garnish (Optional): Immediately after frosting (so the garnishes stick), top each cupcake with a fresh raspberry, a sprinkle of extra lemon zest, or a small, twisted lemon slice.
4. Chill Briefly (Optional but Recommended): Especially if using cream cheese frosting, chilling the frosted cupcakes in the refrigerator for about 15-30 minutes can help the frosting set, making them easier to handle and transport.