To begin, start a pot of water to cook the rotini according to package directions to just al dente. Preheat your oven to 400 degrees.
Meanwhile, cut the chicken breasts into 1/2 inch pieces.
Sprinkle the diced chicken with 1/2 teaspoon each of salt and ground black pepper.
Heat the coconut oil in a large, oven safe skillet over medium high heat. Add in the chicken and cook until opaque and slightly golden.
While the chicken is cooking, pour the tomatoes into your food processor. Give the tomatoes several pulses.
Add in the garlic, basil, oregano, marjoram, cayenne pepper, salt, ground black pepper, & sugar. Plus the mixture again until it is smooth.
Pour the sauce into the skillet with the chicken.
Bring it to a gentle boil, reduce the heat to low and simmer covered for 15 minutes.
While the sauce simmers, shred the mozzarella cheese.
When the sauce is done simmering, stir in 2/3 cup grated parmesan cheese. Stir until it is melted in.
Add in your cooked & drained rotini and stir it together.
Sprinkle the mozzarella on top along with the remaining 2 tablespoons of grated parmesan. Bake this uncovered for 10 minutes or until the cheese is melted on top and just beginning to turn golden on the edges.