Step 1: Preheat your oven to 375°F (190°C). Line a large baking sheet with parchment paper.
Step 2: In a large skillet, heat olive oil over medium heat. Add ground beef and diced onion (if using). Cook, breaking up the beef with a spoon, until browned and no longer pink. Drain any excess grease.
Step 3: Stir in garlic powder, onion powder, salt, and black pepper. Cook for 1 minute until fragrant.
Step 4: Remove from heat and stir in ketchup and mustard until well combined. Let the mixture cool slightly for about 5 minutes.
Step 5: Gently unroll each can of crescent roll dough onto your prepared baking sheet or a clean surface. Do not separate the triangles; keep them in two rectangles. Pinch seams together to form a solid rectangle if desired, or use as is.
Step 6: Spoon about 1/4 cup of the ground beef mixture onto the wider end of each crescent dough rectangle. Top with about 2 tablespoons of shredded cheddar cheese.
Step 7: Fold the narrower end of the dough over the filling to form a pocket. Press the edges firmly to seal, then use a fork to crimp the edges closed. Ensure there are no open seams.
Step 8: Transfer the sealed pockets to the prepared baking sheet, leaving some space between each.
Step 9: Bake for 15-18 minutes, or until the pockets are golden brown and puffed up.
Step 10: Carefully remove from the oven and let cool for a few minutes before serving. Serve warm with extra ketchup, mustard, or your favorite burger sauce for dipping.