1-Step 1: Prepare the Brown ButterFirst, brown the butter to give your bars that amazing nutty flavor. Start by melting 1 cup of butter in a saucepan over medium heat. Stir it constantly until it turns a golden brown color, which takes about 5-7 minutes. Once done, pour it into a heat-proof bowl and let it cool to room temperature this step is crucial so it doesn’t make the dough too greasy.

2-Step 2: Preheat and Mix Dry IngredientsPreheat your oven to 350°F to get it ready for baking. In a small bowl, mix 2 teaspoons of baking soda with 2 teaspoons of water and set it aside; this helps the bars rise nicely. For more ideas on baking basics, check out our recipe for chocolate chip banana bread, which uses similar techniques.

3-Step 3: Cream the Wet IngredientsIn a large mixing bowl, cream together the cooled browned butter, 1 cup of shortening, and 3 cups of sugar until it’s light and fluffy this usually takes 2-3 minutes with an electric mixer. Add in 4 large eggs one at a time, followed by 2 teaspoons of vanilla extract, and mix well. Then, stir in the baking soda mixture and 2 teaspoons of salt to blend everything smoothly.

4-Step 4: Add the Flour and BakeGradually add 5 cups of flour, one cup at a time, mixing after each addition until the dough forms. Spread the batter evenly in a greased jelly roll pan. Bake for 20-25 minutes, but keep an eye on it to avoid overbaking the edges should be golden, and a toothpick inserted in the center should come out clean. Let the bars cool completely on a wire rack before moving on.

5-Step 5: Make the FrostingFor the fluffy buttercream frosting, beat 1/2 cup of softened butter and 1/2 cup of vegetable shortening together until smooth. Add 1/2 cup of marshmallow cream and mix it in, then gradually beat in 4 cups of powdered sugar. Finally, add 1 tablespoon of milk and 1 teaspoon of vanilla extract, beating until it’s fluffy. If you want color, mix in 1 teaspoon of food coloring at this stage. For more on frosting tips, you might enjoy learning from brown butter basics.

6-Step 6: Frost and ServeOnce the bars are cool, spread the frosting evenly over the top. Cut into squares and serve. The total time is about 45 minutes, making it ideal for busy parents or students. For dietary adaptations, use gluten-free flour if needed, or swap eggs for a flaxseed mixture in vegan versions.