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 F for 25-30 minutes. Cut into squares. Serve hot or cold. Great appetizers!
By Robin from Washington, IA
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