Peanut Butter Mug Cake without Milk
Peanut Butter Mug Cake without Milk that’s rich, moist and ready in minutes. An easy microwave cake for a quick single-serve dessert!
Servings 1 serve
Calories 776kcal
Ingredients
- 4 Tbsp all-purpose flour
- 1 1/2 tsp cornstarch
- 2 Tbsp granulated sugar
- 1/2 tsp baking powder
- Pinch salt
- 2 Tbsp peanut butter, crunchy or smooth
- 2 Tbsp water, room temperature
- 1 Tbsp unsalted butter, melted
- 1 Tbsp extra virgin olive oil, or any neutral flavoured oil
- 1 tsp vanilla extract
Topping
- 1/2 Tbsp peanut butter, crunchy or smooth warmed to drizzle, optional
- 1 Tbsp semi-sweet chocolate chips, optional
Instructions
- Prepare the Mug: Lightly grease a microwave-safe mug (240–350 ml / 8–12 fl oz) with soft butter, coating the base and sides. Set aside.
- Mix Dry Ingredients: In a small mixing bowl, whisk together the flour, cornstarch, sugar, baking powder, and salt until evenly combined.
- Warm the Peanut Butter: Add the peanut butter to a small saucepan and warm over low heat for 30–60 seconds, stirring until it loosens into a smooth, pourable consistency. It should still be slightly thick but easy to mix into the batter. This can also be done in the microwave in short bursts.
- Add Wet Ingredients: Add the warmed peanut butter, melted butter, oil, water, and vanilla extract to the dry mixture. Whisk just until the batter is smooth and combined, avoiding overmixing, just until streaks of flour disappear, then stop.
- Transfer to Mug: Pour the batter into the greased mug and gently smooth the top.
- Microwave: Microwave on full power/high for 60-70 seconds before checking and until it has risen. The surface will look dry and set rather than glossy. You shouldn’t see any wet batter on top. The cake will pull away from the sides of the mug slightly, which is a good sign it’s cooked through. If needed, continue microwaving in 10-15 second bursts until just cooked. Let the mug cake rest for 1 minute in the microwave before removing. Microwave Wattage Note: This timing is based on my 900-watt microwave. If your microwave is more powerful, start checking earlier, around 50–60 seconds, to avoid overcooking.
- Prepare the Topping (optional): Warm the extra peanut butter (1 Tablespoon) in a small saucepan over low heat for 20–30 seconds until slightly runny and easy to drizzle.
- Serve: If using, add chocolate chips and drizzle over peanut butter. Enjoy warm straight from the mug, or carefully loosen the edges and lift out. Enjoy!
Video
Notes
Cooked cake: If there’s any leftover, remove the mug cake from the mug and store it in an airtight container in the fridge for up to 2 days. Tip: If you prefer, you can leave it in the mug, covered loosely, but the bottom may be slightly more moist compared to storing in a container.
Reheating: Warm gently in the microwave for 10–15 seconds before enjoying.
Nutrition
Calories: 776kcal | Carbohydrates: 68g | Protein: 13g | Fat: 52g | Saturated Fat: 17g | Polyunsaturated Fat: 7g | Monounsaturated Fat: 25g | Trans Fat: 0.5g | Cholesterol: 31mg | Sodium: 179mg | Potassium: 555mg | Fiber: 4g | Sugar: 34g | Vitamin A: 358IU | Calcium: 125mg | Iron: 3mg