Pesto Chicken and Spaghetti Squash Bake (Low Carb, Gluten Free)

Name: Pesto Chicken and Spaghetti Squash Bake (Low Carb, Gluten Free)
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: American, Italian
Ingredients: 5 cups cooked spaghetti squash (about 1 small-medium squash); 2 1/2 cups chicken breasts (about 1 lb, cooked ); 1 cup pesto; salt and pepper (to taste); 1/2 tsp garlic powder; 1/2 tsp onion powder; 8 oz grated mozzarella cheese (about 1 1/2 cups); 3 tbsp parmesan cheese; 2-3 medium tomatoes; 1 1/2 cups packed basil leaves; 1 clove garlic (blanched); 1/4 cup pine nuts; 1/4 cup sunflower seeds; 3 tbsp lemon juice; 1/4 tsp salt; 1/4 tsp pepper; 1/4 cup parmesan reggiano cheese (grated); 1/2 cup olive oil