Line a baking sheet with foil and spray with nonstick cooking spray. Place 8 slices of bacon on top of the foil. Sprinkle rosemary over the top of the bacon along with pepper. Bake bacon for about 12-14 minutes or until crisp. Remove from oven and place bacon on a paper towel. Once cooled, chop and set aside.
In a medium skillet preheated to medium heat, melt butter. Add the onion and minced garlic and cook until softened, about 4 minutes. Next, stir in the flour and cook for about a minute. Pour in the broth, milk, and oregano. Stir to combine and continue to stir about 3 minutes or until thickened. Remove from heat and stir in mozzarella.
Spray another baking sheet with nonstick cooking spray. Roll out the dough into a 9x13" rectangle. Spread the white sauce over the dough leaving a one-inch border. Place apple slices evenly on the pizza, making sure to cover. Next, sprinkle the bacon on top followed by cheddar cheese. Bake pizza for about 20 minutes or until golden brown. Remove and garnish with basil.