Ingredients
2 cups all-purpose flour (250 grams)
3/4 cup cocoa powder, sifted (68 grams)
3/4 teaspoon baking soda
1/2 teaspoon salt
1 cup unsalted butter (226 grams)
1 cup granulated sugar (200 grams)
1/2 cup brown sugar (205 grams)
2 large eggs
2 teaspoons vanilla extract
2 teaspoons vegetable oil or canola oil
3/4 cup unsalted butter, softened (168 grams)
2 to 3 cups powdered sugar, sifted (220 to 330 grams)
1/2 cup cocoa powder, sifted (45 grams)
1 teaspoon vanilla extract
1/4 teaspoon salt
1 to 2 tablespoons whipping cream or milk
Instructions
1. Preheat oven to 350F (180C). Lightly grease a 9×13 inch baking pan and line with parchment paper.
2. In a medium bowl, sift together flour, cocoa powder, baking soda, and salt. Whisk to combine.
3. In a large bowl, beat butter, granulated sugar, and brown sugar until creamy.
4. Add eggs, vanilla extract, and oil. Mix until fully incorporated.
5. Gradually mix dry ingredients into wet ingredients on low speed until combined.
6. Spread dough evenly into prepared pan using an offset spatula.
7. Bake for 24 to 29 minutes, until the top looks set and a toothpick comes out with moist crumbs.
8. Allow bars to cool completely before frosting.
9. For frosting, beat softened butter until smooth.
10. Mix in sifted powdered sugar and cocoa powder on low speed.
11. Add vanilla and salt.
12. Add remaining powdered sugar alternately with cream until desired thickness is reached.
13. Spread frosting over cooled bars.
14. Refrigerate for at least 20 minutes before slicing into 18 bars.
Notes
Store in an airtight container at room temperature for up to 3 days or in the refrigerator for up to 5 days.
For chewier bars, bake closer to 24 minutes. For cake-like bars, bake closer to 29 minutes.
Nutrition values are estimates based on 1 bar with frosting, assuming 18 equal slices.
- Prep Time: 30 minutes
- Cook Time: 25 minutes
- Category: Cookies
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Nutrition
- Serving Size: 1 bar
- Calories: 355
- Sugar: 30g
- Sodium: 156mg
- Fat: 20g
- Saturated Fat: 12g
- Unsaturated Fat: 6g
- Trans Fat: 1g
- Carbohydrates: 45g
- Fiber: 3g
- Protein: 4g
- Cholesterol: 68mg