Chicken Alfredo Pizza

INGREDIENTS

• 2 tablespoons butter
• Kosher salt and freshly ground black pepper
• 1 cup grape tomatoes, red and yellow
• 1 clove garlic, minced
• 1 (3/4 pound) boneless skinless chicken breast
• 1 (16-ounce) ball pizza dough, store-bought
• 1/4 cup grated Parmesan
• 2 cups baby spinach, well washed and dried
• 1 cup heavy cream
• 1 tablespoon all-purpose flour, plus more for work surface
• Olive oil, for brushing crust
• 1 teaspoon red pepper flakes
• 1 cup grated mozzarella