Cheesy Italian Breakfast Bowl

large, round loaf of sourdough bread

teaspoons, plus 2 tablespoons olive oil, divided

kosher salt, divided

black pepper, divided

large eggs

sweet Italian turkey sausage

small red onion, thinly sliced

red bell pepper, thinly sliced

chopped fresh basil

grated part-skim mozzarella cheese

grated Parmesan