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a square lunch lady brownie with frosting next to a glass of milk.
5 from 18 votes

Lunch Lady Brownies

Lunch Lady Brownies are the most delicious chocolate fudgy brownies with a decadent layer of chocolate buttercream frosting.
Author Diana
Servings 15 brownies
Prep Time 15 minutes
Cook Time 20 minutes
Cooling/Setting Time 1 hour
Total Time 1 hour 35 minutes

Ingredients

For the Brownies:

  • 1 cup (240 ml) unsalted butter (melted)
  • ½ cup (50 g) unsweetened cocoa powder
  • 2 cups (400 g) granulated sugar
  • 4 large eggs at room temperature
  • 1 tablespoon (15 ml) pure vanilla extract
  • ¼ teaspoon salt
  • 2 cups (250 g) all-purpose flour

For the Chocolate Frosting:

  • ¼ cup (60 ml) butter (softened)
  • ¼ cup (60 ml) milk
  • ¼ cup (25 g) unsweetened cocoa powder
  • 3 cups (375 g) powdered sugar
  • 2 teaspoons (10 ml) pure vanilla extract

Instructions

  • Preheat your oven to 350°F (180°C). Grease a 9x13-inch (approx. 23x33 cm) baking pan, or a jelly roll pan 10.5 x 15.5-inch (approx. 26x39 cm). Line with parchment paper for easy removal.
  • In a large mixing bowl, whisk together the melted butter and cocoa powder until smooth. Add in sugar, and mix until combined and eggs, followed by the vanilla extract and salt. Mix until smooth.
  • Add the flour, and whisk until combined. Do not over stir.
  • Pour the batter into the prepared baking pan and spread it out evenly.
  • Bake in the preheated oven for 18-20 minutes or until a toothpick inserted into the center comes out with a few crumbs.
  • Remove from the oven and allow to cool completely.

For the Chocolate Frosting:

  • In a medium-sized mixing bowl, using a hand mixer, beat together the softened butter, milk, cocoa powder, powdered sugar, and vanilla extract until smooth and creamy.
  • Once the brownies are completely cooled, spread the frosting over the top.
  • Allow to cool and set before slicing into squares.

Notes

  • Use Room Temperature Ingredients: Brownie batter mixes up perfectly smooth when the eggs and melted butter are at the same temperature. Let the butter cool down for a bit after melting it, and let the eggs sit out on the counter.
  • Don't Overmix. The flour is added to the batter last and only needs to be stirred in until you don't see any flour. Overmixing will lead to brownies that are dry and overly cakey.
  • Add More Chocolate! Stir mini chocolate chips into the batter, or top the brownies with chocolate shavings if you want to.
  • Chopped pecans or walnuts can also be added if you like nuts in your brownies.
  • If the frosting is too thick or too runny, you'll want to adjust it. You can thicken the frosting by adding more powdered sugar, or thin it out with a tiny bit of milk.
  • To Store: Store the brownies covered at room temperature for up to 4 days, in the fridge for up to a week, or in the freezer for up to 3 months. 

Nutrition

Serving: 1brownie | Calories: 429kcal | Carbohydrates: 66g | Protein: 5g | Fat: 18g | Saturated Fat: 11g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 1g | Cholesterol: 91mg | Sodium: 61mg | Potassium: 114mg | Fiber: 2g | Sugar: 51g | Vitamin A: 549IU | Calcium: 25mg | Iron: 2mg