Preheat oven according to pizza crust baking instructions. Fully bake, about 15-20 minutes, then set aside to slightly cool.
While crust is baking, cook ground beef over medium heat in a large saute pan until browned, about 5 minutes. Drain grease and set aside.
In same pan, add onion and pepper. Cook until veggies are tender and starting to brown, about 10 minutes. Set aside.
Spread Homemade Pizza Sauce evenly over cooked pizza crust, leaving an edge for crust. Top with mozzarella cheese, then beef, onion, and pepper. Return to oven and cook an additional 5-10 minutes, or until cheese is melted and golden brown.