Top dough with mozzarella, asparagus, and bacon. Drop spreadable cheese by teaspoonfuls over pizza. Sprinkle with red pepper flakes. Drizzle with olive oil. Bake at 425 for 12-15 minutes.
Saute spinach until wilted. Transfer to strainer and press out excess liquid.
Saute mushrooms for 3-4 minutes. Remove
Cook onions for 10 minutes. Add sugar. Cook another 10 minutes. Add balsamic vinegar. Set aside.
In small saucepan, melt butter and add flour and garlic and cook for 1-2 minutes. Add warm milk. Add Parmesan. Salt and pepper to taste.
To pizza dough with white sauce. Sprinkle on 1-1/2 cups mozzarella cheese, followed by mushrooms, spinach, and caramelized onions, remaining mozzarella and feta cheese.
Bake dough for 8 minutes at 405 degrees. Meanwhile, in a large skillet, cook bacon and onion until bacon is crisp. Remove. Add bratwurst to the same pan, cook until browned.
In a small bowl, mix preserves and mustard. Spread over crust. Top with bratwurst, bacon mixture, and cheese. Bake for 8-10 minutes more.