Preheat oven to 350°F (175°C). Grease a 9×13 inch baking pan.
In a large bowl, mix flour, sugar, cocoa powder, baking powder, baking soda, and salt.
Add milk, vegetable oil, eggs, and vanilla. Mix until smooth.
Stir in boiling water until well combined.
Pour batter into the prepared pan. Drop spoonfuls of peanut butter over the batter.
Sprinkle chocolate chips on top.
Bake for 35-40 minutes, until a toothpick inserted into the center comes out clean.
Prep Time: 15 mins | Cooking Time: 40 mins | Total Time: 55 mins
Kcal: 400 | Servings: 12
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