Place Flatzza on a sheet pan and toast in the oven for approximately 10 minutes until it begins to crisp.
While flatbread is toasting in the oven pre-cook the mushrooms by adding 1 teaspoon of olive oil to a saute and cook on medium heat until all juices are evaporated. Set aside.
Add 1 tsp of olive oil to the pan and add the spinach. Season with salt and garlic powder. Saute until wilted. Drain and set aside.
Remove flatbread from oven once it is starting to crisp. Top it with sauce, wilted spinach, sliced bell pepper, sweet onion, and sauteed mushrooms. Bake it for approximately 15 minutes when flatbread is browned and crisp.