Heat oven to 350*. Spray 13x9" (3 quart) glass baking dish with cooking spray. In small bowl, mix 1 cup Bisquick mix, the nuts, and brown sugar. Cut in 3 tablespoons cold butter with fork or pastry blender until mixture is crumbly; set aside.
Spread apples in baking dish. In medium bowl, stir remaining ingredients until blended. Pour over apples. Sprinkle with topping.
Bake about 55 minutes or until knife inserted in center comes out clean. Cool slightly, about 30 minutes. Serve warm with ice cream or whipped cream, if desired.