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Preheat the Oven
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Set oven to 375°F (190°C).
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Lightly grease a medium baking dish.
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Roast the Potatoes
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Toss potato cubes with olive oil, salt, and pepper.
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Spread on a baking tray and roast for 25 minutes, until tender and slightly golden.
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Prepare the Bean Mixture
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In a bowl, mix:
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baked beans
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chopped onion
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smoked paprika
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garlic powder
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Stir well to combine flavors.
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Assemble the Casserole
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Add roasted potatoes to the baking dish.
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Spoon the bean mixture over the potatoes evenly.
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Add any optional protein if using.
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Add the Topping
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Spread sour cream over the top.
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Sprinkle cheddar + mozzarella evenly.
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Drizzle melted butter on top for extra richness.
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Bake Until Bubbly
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Bake uncovered for 20–25 minutes, until:
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cheese is melted
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edges are bubbling
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top is lightly golden
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Rest & Serve
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Let sit for 5 minutes before serving.
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Garnish with parsley or green onions if desired.