If you are using a pizza stone, heat it in your oven at 500 degrees for 30 minutes; otherwise, preheat the oven to 500 degrees.
Sauté the garlic, sliced mushrooms and red peppers until just tender, about 5 minutes. Set aside.
Using approximately two-thirds of the pizza dough, stretch the dough carefully until it is 14” in diameter.
Place the dough on pizza peel or baking sheet that has been sprinkled heavily with semolina.
Spread the pesto across the dough, and then spread the tomato sauce over the pesto.
Pile the spinach over the sauce.
Sprinkle 1 cup of the mozzarella over the spinach.
Layer the mushrooms and red peppers on top of the mozzarella, then the rest of the mozzarella, sundried tomatoes, sliced onions.
Sprinkle the remaining Parmesan and crumbled goat cheese over the top.
Season with a bit of salt, black pepper and red pepper flakes if you’d like it a little spicier.
Slide the pizza onto the hot stone or place the baking sheet in the hot oven and bake for 8-12 minutes (if you are using a baking sheet, it will probably take longer to bake).
Remove from oven, slice and enjoy!