Gather your ingredients, including pizza dough (store-bought or homemade), tomato sauce, olive oil, garlic, onion, bell peppers, mushrooms, spinach, vegan cheese, and any other toppings you like.
Preheat your oven to the temperature specified for your pizza dough (usually around 425°F or 220°C).
Chop your vegetables and sauté them in a pan with olive oil and minced garlic until they are tender. Season with salt and pepper to taste.
Roll out your pizza dough on a floured surface to your desired thickness. Place it on a baking sheet or pizza stone lined with parchment paper.
Spread a layer of tomato sauce over the pizza dough, leaving a small border around the edges for the crust.
Sprinkle your sautéed vegetables evenly over the tomato sauce. Add any additional toppings you like, such as vegan cheese, olives, or fresh herbs.
Place the pizza in the preheated oven and bake for about 15-20 minutes, or until the crust is golden brown and the toppings are heated through.
Remove the pizza from the oven and let it cool for a few minutes before slicing. Serve hot and enjoy your homemade vegan pizza!