This oven baked Amish-style yellow onion noodle bake is the kind of frugal, comforting supper that turns a few pantry basics into something cozy and filling. Layering raw sliced onions right over dry mafalda pasta keeps the prep wonderfully simple, and as it bakes, the onions soften and sweeten while the noodles soak up all that creamy, savory goodness. It is an easy family meal with old-fashioned charm, perfect for busy nights when you want dinner in the oven without much fuss.
Serve this noodle bake with a crisp green salad, steamed green beans, buttered peas, or simple applesauce for a classic homey plate. If you want to round it out a little more, a slice of buttered bread or a spoonful of cottage cheese on the side fits right in and makes the meal feel extra hearty.
Oven Baked 4-Ingredient Amish Yellow Onion Noodle Bake
Servings: 6
Ingredients
12 ounces dry mafalda pasta
2 large yellow onions, thinly sliced
4 cups whole milk
2 cups shredded sharp cheddar cheese
Directions
1. Preheat the oven to 375°F. Lightly grease a 10- to 12-inch cast iron casserole dish or oven-safe skillet.
2. Spread the dry mafalda pasta evenly in the casserole dish. Scatter the sliced yellow onions all over the top, separating the slices as you go so they bake evenly.
3. Pour the milk slowly over the pasta and onions, making sure most of the noodles are moistened. Sprinkle the shredded cheddar cheese evenly across the top.
4. Cover the dish tightly with foil and bake for 35 minutes. Remove the foil and continue baking for 20 to 25 minutes more, until the pasta is tender, the onions are soft, and the top is bubbling and lightly browned.
5. Let the bake rest for 10 minutes before serving so the sauce can settle and the noodles can finish absorbing the liquid. Spoon onto plates and serve warm.
Variations & Tips
For a richer bake: Use half-and-half for 1 cup of the milk if you want a creamier, more old-fashioned casserole texture. This is especially nice when you are serving it as the main dish on a cold evening.
For picky eaters: Slice the onions very thin so they melt down more as they bake. You can also stir the onions into the pasta a bit before adding the milk so they are tucked throughout instead of sitting right on top.
For extra flavor: A pinch of black pepper or a little paprika can be added before baking, even though the base recipe is meant to stay beautifully simple. Sharp cheddar gives the most flavor, but mild cheddar works well for kids.
To prevent dry spots: Check the casserole near the end of baking. If the top looks too dry before the pasta is tender, add a small splash of warm milk around the edges and cover loosely with foil for the last few minutes.
Make-ahead note: Because the pasta goes in dry, this recipe is best assembled right before baking so the noodles do not absorb liquid unevenly while sitting out. If you need to prep ahead, slice the onions and measure the other ingredients earlier in the day.