Cauliflower Pizza Casserole

Ingredients

• 1 head cauliflower, chopped
• 1 quart mushrooms, sliced
• 3 cups fresh spinach
• 10 slices of pepperoni, plus 20 sliced for on top
• 1/4 cup mozzarella, plus 3/4 cup for on top
• 5 cloves garlic, minced
• 1/4 cup heavy cream
• sea salt and freshly ground black pepper
• 1 tsp garlic powder
• About 3 T olive oil for baking
• 2 T butter for sauteeing