1. Preheat the oven to 350 degrees F.

2. In a medium saucepan warm the mascarpone, ½ cup Parmesan cheese, red pepper flakes, and ½ cup shredded mozzarella until they are all melted together.

3. In a large bowl toss the melted cheese sauce with the cooked pasta.

4. Spread the marinara sauce on the bottom of 13 x 9 baking dish in one even layer. Pour the pasta mixture on top of it. Scatter the breadcrumbs evenly on top and dot with the butter. Bake for 30 minutes, or until the top is toasted and the cheese is bubbly. If the panko doesn’t toast as much as you’d like, turn on the broiler and toast for about 2 or 3 minutes – watch carefully!