This 5-ingredient Kickoff to Summer Casserole is my go-to when I want dinner handled hours before everyone shows up in the backyard. It bakes into a gorgeous, succulent roasted layer on top—bubbling, caramelized, and a little bit smoky—while the veggies and sausage underneath get cozy and flavorful. It’s inspired by the easy sheet-pan suppers I grew up with here in the Midwest, but tucked into a casserole dish so you can pop it in the oven, forget about it, and pull out something that looks like you worked much harder than you did.
I like to serve this casserole with a simple green salad and a basket of buttered corn on the cob or warm dinner rolls. It’s also great alongside anything coming off the grill—burgers, brats, or chicken—because the roasted, cheesy top and tender potatoes underneath feel like a hearty side or a main dish, depending on how much you scoop. A pitcher of iced tea or lemonade and a bowl of sliced watermelon on the table really round out that summer cookout feeling.
Kickoff to Summer 5-Ingredient CasseroleServings: 6
Ingredients
1 1/2 pounds small red potatoes, cut into 1-inch chunks
1 pound smoked sausage or kielbasa, sliced into 1/2-inch rounds
2 cups fresh green beans, trimmed and cut into 2-inch pieces
1 (16-ounce) bottle thick barbecue sauce (your favorite, about 2 cups)
2 cups shredded cheese (cheddar, Colby-Jack, or a blend)
Directions
Preheat your oven to 400°F (200°C). Lightly grease a 9x13-inch ceramic baking dish so the edges don’t stick and the roasted layer can release easily.
Add the potato chunks to the baking dish in an even layer. Scatter the sliced smoked sausage over the potatoes, then add the green beans, tucking them in so everything is fairly level. This helps the top get that even, succulent roasted layer.
Pour the barbecue sauce evenly over the potatoes, sausage, and green beans. Use a spoon or spatula to gently toss everything right in the baking dish until all the pieces are coated. Spread back into an even layer so nothing is piled too high in one spot.
Cover the baking dish tightly with foil and bake for 30 minutes. This gives the potatoes a head start and keeps the moisture in so they soften before we build the caramelized top.
Carefully remove the foil (watch for steam). Stir the casserole gently to re-coat everything in the sauce. Spread it back out into an even layer, then sprinkle the shredded cheese evenly over the top, all the way to the corners for a full, cheesy roasted crust.
Return the casserole to the oven, uncovered, and bake for another 20–25 minutes, or until the cheese is melted, bubbling, and starting to brown in spots and the sauce around the edges is thick and caramelized. The potatoes should be tender when pierced with a fork.
If you’d like a deeper, glistening roasted look on top, turn the broiler on high for 2–3 minutes, watching closely so the cheese doesn’t burn. You’re aiming for golden brown with a few dark, toasty spots.
Remove the casserole from the oven and let it rest for at least 10 minutes before serving. This helps the sauce thicken a bit and makes it easier to scoop clean portions. The top should look glossy and richly browned, with little pockets of caramelized sauce around the edges—perfect for an easy, make-ahead kickoff to your summer cookout.
Variations & Tips
For picky eaters, you can swap the green beans for corn kernels or sliced bell peppers, or even use a mild, sweeter barbecue sauce to keep the flavors kid-friendly. If your family prefers chicken, substitute the smoked sausage with 1 pound of cooked, chopped rotisserie chicken; stir it in after the first 30 minutes of baking so it doesn’t dry out. For a little extra summer flair, sprinkle 1 teaspoon of smoked paprika or a handful of sliced green onions over the top just before serving. To make this a bit lighter, use turkey sausage and a reduced-sugar barbecue sauce, and cut the cheese back to 1 1/2 cups. You can also build it ahead: assemble the casserole up through coating everything in barbecue sauce, cover tightly, and refrigerate up to 8 hours; when ready to bake, let the dish sit at room temperature for about 20 minutes while the oven preheats, then proceed with the baking directions, adding a few extra minutes if needed. For food safety, always keep the sausage and cheese refrigerated until you’re ready to assemble, and don’t leave the baked casserole out at room temperature for more than 2 hours (or 1 hour if it’s very hot outside during a cookout). Reheat leftovers to at least 165°F (74°C) before serving, and store them in shallow containers in the fridge within 2 hours of cooking. If you choose to broil at the end, keep the dish on the middle rack and watch it constantly; broilers can char cheese quickly.
