Melt butter in skillet over medium-high heat until bubbly, add chopped onion and cook for 3-4 min or until onion is fragrant and soft.

Add to the skillet flour, salt and pepper. Stir in chicken broth and 1/2 C. milk slowly and continue stirring until sauce has thickened.

Bring chicken and vegetables to skillet and mix well.

In a small bowl combine bisquick, remaining milk and egg.

Pour filling into baking dish and pour Bisquick batter over top and spread to even out. Pop it in the oven for 30 min. Enjoy!