It's easy to sneak more veggies into this meal like spinach, zucchini and carrots are a few I have tried. The filling can be used in manacotti shells or even layered in lasagna. I have also substituted the tomato part of the recipe with store bought spaghetti sauce or alfredo sauce.
Place chicken breast in gallon zipoloc baggie add 1/4 C greek yogurt (half), 1T italian seasoning & 1 tsp garlic powder let marinade in fridge for 15-30 minutes.
Place the chicken on baking sheet coated with nonstick spray. Bake for 20-30 minutes until clear juices run through. Set aside to cool and cut into a small dice.
Meanwhile bring large stock pot of salted water to a boil and cook jumbo shell pasta until al dente according to package instructions. Drain and rinse.
Filling: in large mixing bowl combine 1/4 C greek yogurt, 1 C cottage cheese, 1 1/2 C shredded cheese, 1T italian seasoning, 1tsp garlic powder. Then add cooled chicken.
Saute in skillet 1 T olive oil, diced yellow onion, mushroom & red bell pepper until soft. Add tomato paste, chicken stock or white wine, remainder of garlic powder and italian seasoning, red pepper flake and large can crushed tomatoes. Simmer for 5 minutes.
dish up 3/4C of the sauce and refrigerate until cooled and add to filling mixture (this step avoids melting the cheese)
Spoon filling into each of the jumbo shells 1/2 full then top with mozzarella cheese.
Spray large nonstick casserole or foil pan with nonstick cooking spray, Spoon 2-3T sauce into bottom of the casserole dish.
Place filled shells into casserole dish and top each with sauce. Sprinkle with remaining mozzarella cheese.
Cover shells with foil and bake @ 350 degrees for 30 minutes or until cheese is melted and bubbling.