1️⃣ Preheat the oven to 375°F and line a baking sheet with parchment paper.
2️⃣ In a skillet over medium heat, cook the ground beef and diced onion until the beef is browned and fully cooked. Drain any excess fat. Stir in garlic powder, ketchup, mustard, salt, and pepper. Simmer for 2 to 3 minutes to let the flavors blend, then remove from heat.
3️⃣ Unroll the crescent dough and separate into triangles. Spoon a generous portion of the beef mixture and some shredded cheddar onto the wide end of each triangle.
4️⃣ Roll each triangle up, starting from the wide end and rolling toward the tip, tucking in the sides slightly to seal the filling inside. Place on the prepared baking sheet.
5️⃣ In a small bowl, mix the melted butter with the minced garlic. Brush the tops of the rollups with the garlic butter and sprinkle with parsley or chives if using.
6️⃣ Bake for 12 to 15 minutes, or until the rollups are golden brown and the cheese is melted.
7️⃣ Let cool slightly before serving. Serve with ketchup, mustard, or burger sauce for dipping if desired.