Easy Barbecue Chicken

This is a recipe we enjoy at our house often.

3-4 pounds chicken breast strips
1/3 cup chopped onion
3 Tablespoons butter
1 cup ketchup
1/3 cup vinegar
3 Tablespoons brown sugar
1/2 cup water
1 teaspoons mustard
1 Tablespoon Worcestershire sauce
1/4 teaspoon salt
1/8 teaspoon pepper

Place chicken in 13X9" baking dish. In a small saucepan, saute onion in butter until tender; stir in remaining ingredients. Simmer, uncovered for 10 minutes. Pour over chicken. Bake at 350 degrees about one hour or until...