Clean and chop the bell peppers and onion. Sauté them in a skillet until soft, then remove and set aside.

In the same skillet, cook the ground beef. Season with salt and pepper to taste. Once cooked, remove from heat.

In a baking dish, layer nachos, mozzarella cheese, vegetables, beef, and more cheese.

Add another layer of nachos, vegetables, beef, and the remaining cheese.

Bake for about 15 minutes at 400°F (200°C). Keep an eye on it, as baking times may vary depending on your oven.

Once out of the oven, top with diced tomato and avocado. Enjoy!