Food Recipes Marshmallow Popcorn Bars 3.4 (406) 4 Reviews With only 3 ingredients (popcorn, marshmallows, and butter), these bars take just 10 minutes of prep time. By Kate Merker Kate Merker Kate Merker is the chief food director at Hearst Magazines. She has over two decades of experience producing food content for print and digital publications, including Real Simple. Highlights: * At Real Simple, Kate worked her way up from editorial assistant to senior food editor * Served as food and nutrition director at Woman's Day for seven years * Joined Hearst Magazines as chief food director (2017) Real Simple's Editorial Guidelines Updated on December 18, 2015 Print Share Share Tweet Pin Email These easy 3-ingredient bars take just 10 minutes of prep time. Get the recipe. Photo: John Kernick Hands On Time: 10 mins Total Time: 20 mins Yield: 24 bars Jump to Nutrition Facts Ingredients 2 tablespoons unsalted butter, plus more for the dish ½ cup popcorn kernels or one 3.5-ounce package plain microwave popcorn 1 10-ounce bag marshmallows Directions Butter a 9-by-13-inch baking dish. Pop the popcorn according to the package directions. Melt the butter and marshmallows in a large saucepan over medium-low heat, stirring until smooth, 5 to 7 minutes. Fold in the popcorn until coated. Press into the prepared dish and let sit for 10 minutes before cutting into 24 bars. Print Nutrition Facts (per serving) 69 Calories 1g Fat 13g Carbs Show Full Nutrition Label Hide Full Nutrition Label Nutrition Facts Calories 69 % Daily Value * Total Fat 1g 1% Saturated Fat 1g 5% Cholesterol 3mg 1% Sodium 41mg 2% Total Carbohydrate 13g 5% *The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.