Herb-Infused Garbage Bread with Sun-Dried Tomatoes

1 tablespoon olive oil
1 onion, chopped
1 pound ground beef
Salt and pepper to taste
2 cloves garlic, minced
1 bell pepper, chopped
1/2 cup sun-dried tomatoes, chopped
1 teaspoon Italian seasoning
1 pound pizza dough
1 cup mozzarella cheese, shredded
1 cup cheddar cheese, shredded
1 egg, beaten (for egg wash)