Chicken Alfredo Pizza

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