Preheat oven to 350 degrees F. For topping, pour butter into 9 inch square baking pan; tilt pan to evenly coat bottom of pan. In small bowl, combine walnuts, brown sugar and cinnamon; sprinkle evenly onto bottom of pan. Cut apple slices crosswise in half; arrange over nut mixture.
For cake, combine baking mix, sugar and cinnamon in a large bowl. In small bowl, mix eggs, milk and oil. Add to dry ingredients; stir until just moistened. Pour batter evenly over apples.
Bake 35-40 minutes or until wooden pick inserted in center comes out clean. Loosen edges of cake with knife; carefully invert onto large plate. Serve warm with whipped topping, if desired.
By Robin from Washington, IA
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