Caramel Popcorn Crusted Sweet Potatoes

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1 (40-ounce) can yams, drained

1 (20-ounce) can crushed pineapple, drained

1/2 teaspoon ground cinnamon

2 cups caramel popcorn, coarsely ground and kernels discarded

4 tablespoons margarine, melted

1 tablespoon all-purpose flour

1 tablespoon brown sugar

1 1/2 cups miniature marshmallows