01 -
Throw the ground beef and chopped onion into a hot skillet. Cook them while stirring until browned completely, then get rid of any extra grease.
02 -
Stir the marinara sauce into your cooked beef and season it with salt and pepper to your liking. It's ready to go from here.
03 -
Grab a medium bowl, and stir together the mozzarella and sour cream until they're completely blended.
04 -
Spread the warm beef mixture across the bottom of a 2.5-quart casserole dish. Smooth the cheesy mix on top as evenly as you can.
05 -
Lay out the crescent dough sheet flat and place it carefully over the cheesy layer, covering everything properly.
06 -
Use a small bowl to combine melted butter with grated parmesan. Brush or drizzle this over the dough layer.
07 -
Pop it in an oven preheated to 375°F for 20-25 minutes. It's done when the crust is golden and the filling bubbles.
08 -
Pull it out of the oven and leave it for a bit to cool down before dishing it out to enjoy.