Begin by preheating your oven to 350°F (175°C). Lightly grease a 9×9 inch baking pan.
In a large mixing bowl, blend together the crushed pineapple (juice included), sugar, eggs, cornstarch, and vanilla extract. Stir the mixture thoroughly to ensure all ingredients are well incorporated.
Carefully pour the mixture into your prepared baking pan. Distribute the pieces of butter evenly across the top and sprinkle with cinnamon for a touch of warmth and spice.
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