Preheat oven to 425F. Remove the pizza crust from the package. Place on a baking sheet and bake for 15 minutes.
In the mean time slice mushrooms and chop the spinach.
Sprinkle some cheese over the baked pizza crust. Top with mushrooms and spinach. Sprinkle with garlic powder and basil. Top with cheese.
Bake for 10 more minutes, until the cheese is bubbly.
Slice into squares and serve.