Preheat your oven to 475°F (245°C). If you're using a pizza stone, place it in the oven to heat up as well.
Dust your countertop with cornmeal to prevent sticking. Roll out the pizza dough into your desired shape, aiming for about 12 inches in diameter. Transfer the dough to a pizza stone or baking sheet.
In a large skillet, heat the extra virgin olive oil over medium heat. Add the minced garlic and sauté for about 30 seconds until fragrant. Then, add the sliced mushrooms and cook until they are softened, about 5 minutes. Add the chopped spinach and garlic salt, cooking until the spinach is wilted. Remove from heat.
Spread half of the shredded mozzarella cheese over the pizza dough. Evenly distribute the sautéed spinach and mushroom mixture on top. Sprinkle the sliced red onions and halved cherry tomatoes over the veggies. Finish with the remaining mozzarella cheese and crumbled feta cheese.
Carefully place the pizza in the preheated oven (or on the hot pizza stone). Bake for 12-15 minutes or until the crust is golden brown and the cheese is bubbly and slightly browned.
Once out of the oven, sprinkle the chopped fresh basil over the top for a burst of flavor. Allow the pizza to cool for a few minutes before slicing. Serve hot and enjoy every cheesy, veggie-filled bite!