Start by preheating the oven to 350°. Cook spaghetti following the instructions on the box. Grab a cutting board and begin cubing the chicken into bite size pieces while the oven preheats.
Next, grab a large skillet and melt down the butter. Sauté the chicken, onion powder and garlic in the butter. Cook chicken over medium-high heat for about 7-10 minutes or until the chicken is no longer pink.