This Oven-Baked Amish Three Bean Macaroni is one of those “mix it and walk away” casseroles that saves my weeknights. It leans on a big can of store‑bought three bean salad and just a couple pantry staples, which all get poured right over dry elbow macaroni in a casserole dish. The idea is loosely inspired by simple Amish pantry casseroles that bake everything together—no precooking the pasta, no fancy steps. It comes out tangy, a little sweet, and super cozy, but still light enough to pass as a summer meal. It’s the kind of dish people keep asking about at potlucks because no one believes it started with a can.
Serve this three bean macaroni warm or at room temperature with something fresh and crunchy on the side, like sliced cucumbers, cherry tomatoes, or a simple green salad. It pairs really well with grilled chicken, sausages, or burgers if you’re doing a cookout, and it also works as a stand-alone meatless main with some crusty bread or garlic toast. For picnics or potlucks, I like to bake it ahead, let it cool slightly, and bring it in the same casserole dish with a big spoon—leftovers make an easy lunch with a handful of baby carrots or a piece of fruit.
Oven-Baked 4-Ingredient Amish Three Bean MacaroniServings: 6
Ingredients
2 cups dry elbow macaroni (uncooked)
1 (32-ounce) jar or can three bean salad, undrained
1 cup shredded mild cheddar cheese
1/2 cup mayonnaise
Directions
Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch casserole dish with cooking spray or a thin swipe of oil.
Pour the dry elbow macaroni evenly into the bottom of the casserole dish, spreading it into an even layer so the pasta cooks uniformly.
In a large bowl, add the entire jar or can of three bean salad, including all the liquid. Stir in the mayonnaise until the mixture looks creamy and the dressing is evenly combined.
Pour the three bean salad mixture evenly over the dry elbow macaroni in the casserole dish. Use a spoon or your hands to gently mix and nudge the beans and liquid down into the pasta so most of the macaroni is coated and submerged in the dressing.
Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
Cover the casserole dish tightly with foil to trap in moisture so the dry pasta can absorb the liquid and cook through.
Bake, covered, for 35 to 40 minutes, until the pasta is tender when you poke it with a fork in the center of the dish. If it seems dry at 30 minutes, you can drizzle 1/4 cup hot water around the edges, re-cover, and keep baking.
Remove the foil and bake for an additional 5 to 10 minutes, just until the cheese on top is melted and lightly bubbly.
Let the casserole rest for at least 10 minutes before serving. This helps the sauce thicken slightly and makes it easier to scoop clean portions. Serve warm or at room temperature.
Variations & Tips
You can easily tweak this simple four-ingredient casserole to fit your family and what’s in your pantry. For a little extra protein, stir 1 to 2 cups of diced ham or cooked bacon into the three bean salad mixture before pouring it over the macaroni. If you like more tang and less sweetness, add 1 to 2 tablespoons of apple cider vinegar or a squeeze of lemon juice to the salad and cut back on any excess dressing from the jar if it seems very sweet. For a creamier texture, swap half of the mayonnaise for sour cream or plain Greek yogurt. If you prefer a cheesier top, increase the shredded cheddar to 1 1/2 cups or mix in a sharper cheese like colby jack or pepper jack for a little kick. To stretch it for a crowd, you can add up to 1/2 cup extra dry macaroni and then splash in an additional 1/4 to 1/2 cup water or vegetable broth so the pasta still has enough liquid to cook. For a slightly crisp topping, remove the foil during the last 10 minutes and add a light sprinkle of breadcrumbs tossed with a teaspoon of oil. Food safety tips: Since this casserole contains mayonnaise and cheese, avoid leaving it out at room temperature for more than 2 hours (or 1 hour if it’s very hot outside at a picnic). Refrigerate leftovers promptly in a shallow container and use within 3 to 4 days, reheating only the portion you plan to eat. If you add any meat, make sure it is fully cooked before mixing it into the casserole, and reheat leftovers to at least 165°F (74°C) before serving.
