Preheat oven to 425 degrees. In a medium pan over medium heat, melt the butter into the olive oil. When the butter starts to foam, add the mushrooms; toss to coat. Saute for about 3 to 5 minutes.
Add in the spinach; saute until wilted, about 3 to 5 more minutes, or until most of the moisture has cooked out. Set aside.
The Alfredo Sauce
In a medium pot over medium-low heat, add the melted butter. Add the garlic; saute for one minute. Add the cheeses and milk; cook for 2 minutes, stirring frequently. When the cheeses have melted the sauce is smooth, remove from the heat.
Prepare the Pizzas
Warm the flatbread per package instructions.
Pour ½ of the sauce on each pizza. Spread the Alfredo sauce over both flatbreads, using the back of a spoon.
Top each flatbread with mushrooms and spinach.
Sprinkle the shredded mozzarella over top of the mushrooms and spinach.
Bake for 5 to 10 minutes or until cheese is melted and bubbly. You can turn on the broiler the last few minutes, to help brown up the cheese.
Slice and serve, with red crushed pepper and extra parmesan cheese if desired.
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