01 -
Brown the ground beef with the finely diced onions in a skillet. Drain off any excess fat.
02 -
Fold in the marinara sauce. Season with salt and pepper as desired.
03 -
In a medium-sized bowl, whisk together the sour cream and mozzarella cheese until combined.
04 -
Spread the beef mixture evenly as the base in a 2 1/2-quart casserole dish. Layer the creamy cheese mixture over the beef.
05 -
Unroll the crescent roll dough and lay it over the cheese layer, covering the surface completely.
06 -
Whisk together the melted butter and grated parmesan cheese. Brush the mixture over the crescent roll dough.
07 -
Bake in a preheated oven at 375°F for 20-25 minutes, or until the crust is golden brown and aromatic.
08 -
Let the dish rest briefly after baking. Slice and serve warm.