Step 1

Preheat oven to 350 degrees F. Spray an 8x11" baking dish with cooking spray. (You can use a differently shaped medium-sized baking dish if you don't have this size available.)

Step 2

Cook broken spaghetti according to package directions. Drain and set aside.

Step 3

While pasta cooks, melt butter in a large skillet over medium-high heat. Add onion, bell pepper, mushroom, chicken, tomatoes, Italian seasoning, salt, and pepper. Cook, stirring often, until vegetables are tender and chicken is cooked through. Keep heat fairly high so most of the liquid cooks off in this step.

Step 4

Stir yogurt, cheddar cheese, and parmesan cheese into chicken mixture until well combined. Stir in cooked spaghetti until well coated. Pour pasta into baking dish. Spread mozzarella over the top, and lightly sprinkle with paprika and Italian seasoning if desired.

Step 5

Bake in preheated oven for 25-30 minutes or until cheese is melted and bubbly.