Sweet Potato Supreme is a rich, creamy, and slightly sweet casserole that layers mashed sweet potatoes with a buttery pecan streusel topping. It works because the natural sweetness of the potatoes pairs perfectly with the crunchy, buttery topping, creating a dish that feels both indulgent and comforting. This version is baked in a 9×13-inch pan, making it ideal for holiday dinners or any gathering where you want a standout side dish.
Ingredients
- 4 large sweet potatoes (about 3 lbs / 1.4 kg), peeled and cubed
- 1/2 cup (1 stick / 113 g) unsalted butter, melted
- 1/2 cup (100 g) granulated sugar
- 1/2 cup (120 ml) milk (or heavy cream for extra richness)
- 2 large eggs, lightly beaten
- 1 teaspoon vanilla extract
- 1/2 teaspoon salt
- 1/2 teaspoon ground cinnamon (optional)
- 1/4 teaspoon ground nutmeg (optional)
- For the topping:
- 1 cup (120 g) chopped pecans
- 1/2 cup (100 g) packed brown sugar
- 1/3 cup (40 g) all-purpose flour
- 1/4 cup (1/2 stick / 57 g) unsalted butter, melted
Instructions
- Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.
- Place the cubed sweet potatoes in a large pot and cover with cold water. Bring to a boil over high heat, then reduce to a simmer and cook until fork-tender, about 15–20 minutes. Drain well.
- Transfer the cooked sweet potatoes to a large mixing bowl. Mash them with a potato masher or an electric mixer until smooth. If you prefer a silkier texture, press them through a ricer or food mill.
- Add the melted butter, granulated sugar, milk, beaten eggs, vanilla, salt, cinnamon, and nutmeg (if using). Stir until everything is fully combined and the mixture is smooth. Taste and adjust sugar or spices if needed.
- Spread the sweet potato mixture evenly into the prepared baking dish.
- In a separate bowl, prepare the topping: combine the chopped pecans, brown sugar, flour, and melted butter. Mix with a fork until crumbly and well coated.
- Sprinkle the topping evenly over the sweet potato mixture.
- Bake for 30–35 minutes, until the topping is golden brown and the casserole is heated through. If the topping browns too quickly, loosely cover with foil for the last 10 minutes.
- Let the casserole rest for 5–10 minutes before serving. This allows it to set slightly and makes serving easier.
Tips
- Don’t over-mash: Overworking the potatoes can make them gummy. Mash just until smooth; a few small lumps are fine.
- Use a 9×13 pan: This recipe is designed for a 9×13-inch baking dish (14-cup capacity). If you use a smaller pan, the mixture will be deeper and may need extra baking time; a larger pan will make a thinner layer and bake faster.
- Make ahead: Assemble the casserole (without the topping) up to 24 hours in advance, cover, and refrigerate. Add the topping just before baking, and increase the bake time by about 10 minutes since you’re starting from cold.
- Adjust sweetness: Sweet potatoes vary in natural sweetness. Start with 1/2 cup of sugar, taste the mixture before baking, and add a tablespoon or two more if you like it sweeter.
Serving Suggestions
This sweet potato supreme is a fantastic side dish for roasted turkey, baked ham, or pork chops. It also pairs well with simple roasted chicken and a green salad for a weeknight dinner. Because it’s sweet and rich, serve it alongside more savory sides like green beans, collard greens, or a tangy cranberry sauce to balance the plate.
Variations
- Add marshmallows: For a classic twist, swap the pecan topping for a layer of mini marshmallows added during the last 10 minutes of baking, so they get golden and puffy.
- Use a different nut: Walnuts, almonds, or even crushed cornflakes can replace the pecans in the topping.
- Make it dairy-free: Use a plant-based butter substitute and unsweetened almond or oat milk instead of regular milk and butter.
- Spice it up: Add a pinch of cayenne pepper or a diced jalapeño to the sweet potato mixture for a sweet-heat contrast.
Storage and Reheating
Store leftover sweet potato supreme in an airtight container in the refrigerator for up to 4 days. To reheat, place a portion in the microwave for 1–2 minutes, or reheat the entire casserole in a 350°F (175°C) oven for 15–20 minutes, covered with foil to prevent the topping from burning. You can also freeze the baked casserole for up to 3 months; thaw overnight in the refrigerator before reheating.
Frequently Asked Questions
Can I use canned sweet potatoes? Yes, you can. Drain two 29-ounce cans of sweet potatoes and skip the boiling step. Just mash and proceed with the recipe. The texture may be slightly softer, but the flavor will still be great.
Why is my casserole watery? This can happen if the sweet potatoes aren’t drained well after boiling, or if you used a watery milk alternative. Make sure to drain thoroughly and let them steam dry for a minute before mashing. Also, avoid adding extra liquid.
Can I prepare this the night before? Absolutely. Assemble the casserole without the topping, cover, and refrigerate. Add the topping right before baking, and increase the bake time by about 10 minutes since the dish is cold.
Can I reduce the sugar? Yes, you can cut the granulated sugar down to 1/4 cup, especially if your sweet potatoes are very sweet. The topping also has brown sugar, so the dish will still be sweet.
How do I know when it’s fully cooked? The casserole is done when the topping is golden brown and the edges are bubbling. Insert a knife into the center; it should come out clean and hot. The internal temperature should reach at least 165°F (74°C) if you’re checking with a thermometer.
Can I use a different pan? Yes. For an 8×8-inch square pan, halve the recipe. For a 9-inch round pan, the recipe will fit, but the layer will be deeper, so add 5–10 minutes to the bake time. Always check for doneness with a knife or thermometer.