Mac + Cheese (Lottie + Doof Style)

Ingredients

• 6 tablespoons unsalted butter divided
• 3 slices bacon diced
• 1 cup yellow onion finely chopped
• 1 teaspoon red pepper flakes or less if you would like this with less spice
• 2 garlic cloves small, minced
• 3 tablespoons all-purpose flour
• 3 cups whole milk
• 3 cups sharp cheddar cheese coarsely grated, divided
• 1 cup Parmesan cheese grated
• 4 ounces mascarpone cheese
• 3/4 cup panko Japanese breadcrumbs
• 1/2 cup fresh parsley chopped
• 1 pound penne