INGREDIENTS
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1 box yellow cake mix
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2 eggs
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1/2 cup (1 stick) butter, melted plus 2 Tbsp butter, cut into chunks (cold)
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1 tsp lemon juice
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2 cups fresh blueberries (or use frozen, but thaw them first)
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1/2 cup plus 1 Tbsp flour
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1 Tbsp cinnamon sugar
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2 Tbsp brown sugar
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1/3 cup quick oats