Preheat oven to 350 F and use cooking spray to grease the cavities of a jumbo muffin pan.
Whisk together flour, salt, basil, onion powder, garlic powder, oregano, sugar, and yeast in a large bowl.
Use a dough whisk or your hands to mix in oil and warm water until a dough forms.
Flatten a circle of dough to about 1/8" thick and about 2.5 inches in diameter. Spread a thin layer of sauce on the dough and top with a few pieces of any combination of mushrooms, spinach, and/or broccoli. Sprinkle a heaping teaspoon of cheese over the toppings and press the dough closed around the toppings to form a ball.
Repeat with the remaining dough and toppings. (You will have sauce and cheese left over.)
Fill each cavity of the muffin pan with dough balls up to almost the top. You should be able to fit about six dough balls per cavity. (The balls will fuse together during the bake to create pizza muffins.)
Spoon about two tablespoons of sauce over each unbaked pizza muffin.
Top with a tablespoon of cheese (or more if you like your pizza really cheesy!).
Bake for 30 minutes and eat them while they are hot!! Optionally, garnish with chopped parsley.