Sausage Squares

1 lb. hot sausage
½ cup chopped onion
¼ cup grated Parmesan cheese
1 egg, beaten
¼ tsp. Tabasco sauce
1-½ tsp. salt
2 tbsp. chopped parsley
2 cups Bisquick
2/3 cup milk
¼ cup mayonnaise
1 egg yolk, beaten

Brown sausage and onion in skillet over low heat, stirring until crumbly. Drain sausage well. Add next 5 ingredients, mixing well.

Mix Bisquick, milk, and mayonnaise in bowl. Spread half the dough over bottom of greased 8 inch baking pan. Cover with sausage mixture. Spread remaining dough over top. Brush with beaten egg yolk.

Bake at 400 degrees for 25 to 30 minutes. Cut into squares. Serve hot or cold.