Some recipes spread through a room faster than the coffee can perk, and this is one of them. It has that old-fashioned potluck charm Midwestern cooks have always loved, the kind of sweet treat that looks humble in the pan but disappears in a hurry once folks get a taste. With just a handful of pantry staples and very little fuss, this is the sort of back-pocket dessert recipe worth keeping around for club meetings, church suppers, family reunions, and those evenings when a chocolate craving calls for something easy and dependable.
Serve these rich bars in small squares with hot coffee, cold milk, or a scoop of vanilla ice cream if you want to dress them up a little. For gatherings, I like to set them out on a tray with fresh strawberries or raspberries to balance the sweetness, and they travel especially well for bake sales, picnics, and shared dessert tables.
Oven Baked 5-Ingredient Mississippi Mud Bars
Servings: 16 bars
Ingredients
1 box fudge brownie mix
2 eggs
1/2 cup vegetable oil
3 cups mini marshmallows
1 tub (16 oz) chocolate frosting
Directions
1. Preheat your oven according to the brownie mix package directions and lightly grease a 9x13-inch glass baking dish.
2. In a large mixing bowl, stir together the fudge brownie mix, eggs, and vegetable oil until a thick batter forms.
3. Spread the batter evenly into the prepared baking dish and bake according to the package directions until the brownies are set.
4. Remove the pan from the oven, immediately sprinkle the mini marshmallows evenly over the hot brownies, and return the dish to the oven for 2 to 3 minutes, just until the marshmallows puff up and begin to toast.
5. Let the bars cool for about 10 minutes, then spread the chocolate frosting over the warm marshmallow layer so it softens into a glossy topping.
6. Cool completely before cutting into squares and serving.
Variations & Tips
Nutty Potluck Pan: If your family likes a little crunch, scatter a handful of chopped pecans or walnuts over the frosting before it sets. That little extra texture gives the bars a more old-fashioned supper-club feel.
Cleaner Slices: For tidy squares, let the bars cool fully before cutting, and wipe your knife clean between slices. A short chill in the refrigerator helps if your kitchen is warm.
Extra Gooey Marshmallow Layer: If you love that sticky middle layer, use a generous hand when measuring the marshmallows and make sure they reach all the way to the corners. Even coverage gives every bite the same soft, gooey finish.
Make-Ahead Tip: These bars can be made a day ahead and covered tightly in the pan. By the next day, the layers settle together beautifully, making them even easier to slice and carry.