Pimiento Mac and Cheese

Name: Pimiento Mac and Cheese
Ingredients: 1 seeded red bell pepper, cut into 1 inch pieces; 2 garlic cloves, halved, divided; 1⁄2 cup panko breadcrumbs; 3 tablespoons unsalted butter, room temperature, divided; 1⁄2 cup freshly grated parmesan cheese, divided; 3⁄4 cup drained mild peppadew peppers in brine, 1 Tb brine reserved; 1⁄4 teaspoon ground ancho chili; 1 1⁄4 cups packed coarsely grated extra-sharp cheddar cheese; 1 cup packed coarsely grated whole milk mozzarella; 8 ounces medium pasta shells (or gemelli)