Preheat oven to 350°F and grease a 9-inch pie dish or cake pan with butter.

In a large bowl, mix together flour, sugar, and undrained fruit cocktail until just combined.

Pour batter into prepared dish. Dot with remaining butter sliced into pats.

Bake for 35–40 minutes, or until top is golden brown.

Let cool at least 10 minutes before serving with ice cream or whipped cream.