Part 1: Prepare the Taco Meat Filling

1. Brown the Beef: Place a large skillet over medium-high heat. Add the ground beef and the finely diced yellow onion. Use a wooden spoon or spatula to break the beef into small crumbles as it cooks.
2. Cook Until Browned: Continue cooking for about 8-10 minutes, or until the beef is no longer pink and the onions have softened and become translucent.
3. Drain the Grease: This is a critical step! Tilt the skillet and carefully spoon out the excess grease. You can also drain the meat in a colander over a bowl. Removing the grease prevents the pocket bottoms from becoming soggy.
4. Add Flavor: Return the skillet to the heat. Add the minced garlic and cook for another minute until fragrant. Be careful not to burn the garlic.
5. Season the Meat: Sprinkle the taco seasoning over the beef, then pour in the 1/4 cup of water. Stir everything together until the meat is evenly coated. Let it simmer for 2-3 minutes, allowing the sauce to thicken slightly.
6. Cool Down: Remove the skillet from the heat and set the taco meat aside to cool slightly while you prepare the queso. A hot filling can melt the crescent dough prematurely.

Part 2: Create the Creamy Queso Sauce

1. Combine Ingredients: In a small saucepan, combine the cubed Velveeta, shredded cheddar cheese, evaporated milk, and the entire can of undrained diced green chiles.
2. Melt Gently: Place the saucepan over low heat. Stir frequently with a whisk or rubber spatula until the cheeses are completely melted and the sauce is smooth and creamy. Low and slow is the key here to prevent the cheese from scorching or becoming grainy.
3. Combine Fillings: Pour the finished queso sauce directly into the skillet with the cooled taco meat. Stir until every crumble of beef is generously coated in the cheesy sauce. Your ultimate pocket filling is now ready!

Part 3: Assemble and Bake the Queso Taco Pockets

1. Preheat and Prepare: Preheat your oven to 375°F (190°C). Line a large baking sheet with parchment paper for easy cleanup and to prevent sticking.
2. Unroll the Dough: Open one can of crescent roll dough and unroll it onto a lightly floured surface. The dough will be perforated into 8 triangles. Press down on the perforations to seal two triangles together, forming 4 rectangles. Repeat with the second can of dough so you have a total of 8 rectangles.
3. Portion the Filling: Spoon a generous amount of the queso-beef mixture onto one half of each rectangle. Be careful not to overfill! Leave about a 1/2-inch border around the edges. Overstuffing is the number one cause of leaky pockets.
4. Fold and Seal: Gently fold the empty half of the dough over the filling to create a pocket. Use your fingers to press the edges together firmly.
5. Crimp for Security: For a decorative and secure seal, use the tines of a fork to press down and crimp all three sealed edges of the pocket. This helps prevent the delicious filling from escaping during baking.
6. Arrange on Baking Sheet: Carefully transfer the sealed pockets to your prepared baking sheet, leaving an inch or two of space between each one for even baking.
7. Apply Egg Wash: In a small bowl, whisk the egg and the tablespoon of water together. Brush this egg wash lightly over the top of each taco pocket. This step is optional but highly recommended for achieving that professional, bakery-quality golden sheen. If you wish, sprinkle with sesame seeds or coarse salt now.
8. Vent the Pockets: Use a sharp knife to cut a small slit or two in the top of each pocket. This allows steam to escape, which helps the pastry cook through and stay crisp.
9. Bake to Golden Perfection: Place the baking sheet in the preheated oven and bake for 12-15 minutes, or until the tops are a deep golden brown and the filling is bubbly.
10. Rest Before Serving: Remove the pockets from the oven and let them cool on the baking sheet for at least 5-10 minutes. The filling will be extremely hot, and this resting period allows it to set up slightly, making for a much more pleasant eating experience.