Step 1

Preheat the oven to 350 degrees F.

Step 2

Coat a 9x13-inch baking dish with cooking spray.

Step 3

Spread an even layer of the sliced potatoes at the bottom of the prepared baking dish.

Step 4

Season the potatoes with the salt and the pepper.

Step 5

Top the potato layer with the cooked ground beef.

Step 6

Layer the sliced onion on top of the beef.

Step 7

Season the onions with the salt and the pepper.

Step 8

Top the onions with the tomatoes, seasoning them with the salt and the pepper.

Step 9

Top the tomatoes with the green peppers.

Step 10

Cover the baking dish with aluminum foil and bake until the casserole is cooked through, about 2 hours.

Step 11

Allow the casserole to cool for 5-10 minutes.

Step 12

Serve.