Step 1

Tip: place sticks of butter in the freezer for at least 15 minutes. Then use a grater grate the butter so that it spreads easily over the top of the cake.

Step 2

Preheat oven to 350°F.

Step 3

Pour pie filling, peaches, and blueberries in the bottom of a 9x13-inch pan. Top with powdered cake mix. Sprinkle brown sugar and nuts, if using, over the top.

Step 4

Grate the frozen butter evenly over the top of the cake mix. Alternately, chop small pieces and spread them evenly. (Grating the butter gives easier and better coverage.)

Step 5

Bake for 45-50 minutes. Serve warm or room temperature with ice cream. Store in refrigerator for up to 3 days.