Macaroni and Cheese Pizza

Name: Macaroni and Cheese Pizza
Ingredients: 1/2 pound dried rotini pasta; Olive oil cooking spray; 6 slices thick-cut good quality bacon; 2 tablespoons unsalted butter; 1 white onion, finely chopped; 1 clove garlic, finely chopped; Pinch ground nutmeg; Salt and freshly ground black pepper; 3 tablespoons all-purpose flour; 2 cups whole milk; 2 cups grated sharp Cheddar; 1 cup grated mozzarella; 1 cup panko breadcrumbs; 1/2 cup Parmesan; 3 tablespoons chopped fresh chives; 1 tablespoon olive oil; 1 store-bought pizza dough, rolled out and spread on a well-oiled baking sheet