How do you make 3 ingredient mug cake with peanut butter?

A 3-ingredient peanut butter mug cake couldn’t be simpler. Just mix 3 tablespoons of creamy peanut butter, 1 egg, and 2 tablespoons of sugar in a microwave-safe mug until smooth. Microwave on high for 60–90 seconds, checking at the 60-second mark to avoid overcooking. The result is a warm, gooey cake that feels indulgent but takes only minutes to make. Optional add-ins like chocolate chips or a pinch of baking powder can elevate the texture and flavor, but the base recipe works beautifully on its own.

How do you make a peanut butter cake in a mug?

Making a peanut butter cake in a mug is all about convenience. Start by choosing a 10–12 ounce microwave-safe mug. Mix peanut butter, an egg, sugar, and any extras like vanilla or baking powder directly in the mug. Microwave until the cake rises and looks set on top, then let it rest for one minute before eating. This short resting time allows the cake to firm up while staying moist. The key is to watch closely every microwave cooks differently, so timing can vary slightly.

How do I stop mug cake from being rubbery?

Rubbery mug cakes are usually the result of overcooking. Since microwaves heat quickly, even an extra 15 seconds can make a big difference. To prevent this, cook your mug cake in 10-second bursts after the initial 60 seconds, checking for doneness each time. Another tip is to avoid overmixing the batter. Stir just until the egg and peanut butter are combined. Lastly, make sure to use fresh peanut butter and a medium-power microwave setting if yours tends to run hot. These small adjustments help keep your cake fluffy and tender.

What are some common mug cake mistakes?

The most common mistakes include using the wrong size mug, skipping baking powder when you want extra fluff, and overloading the batter with add-ins. A mug that’s too small can cause the cake to overflow, while too many mix-ins can make it dense and heavy. Another mistake is eating it straight from the microwave letting it sit for 1–2 minutes allows the texture to settle. Finally, don’t forget balance: peanut butter has a strong flavor, so adding vanilla or chocolate can help round out the taste. Avoid these pitfalls, and your peanut butter mug cake will turn out bakery-worthy every time.

Peanut Butter Mug Cake – Easy 3-Ingredient Microwave Recipe

Name: Peanut Butter Mug Cake – Quick, Easy, and Irresistible
Prep time: 2 min
Cook time: 1 min
Total time: 3 min
Cuisine: American
Ingredients: 3 tbsp creamy peanut butter; 1 large egg; 2 tbsp sugar; Optional: ¼ tsp baking powder; Optional: 1 tbsp chocolate chips

Ingredients

Scale

3 tbsp creamy peanut butter

1 large egg

2 tbsp sugar

Optional: ¼ tsp baking powder

Optional: 1 tbsp chocolate chips

Instructions

1. Add peanut butter, egg, and sugar to a microwave-safe mug.

2. Mix thoroughly until smooth. Stir in baking powder and chocolate chips if using.

3. Microwave on high for 60–90 seconds, checking at 60.

4. Let rest for 1 minute before eating. Add toppings if desired.

Notes

Best enjoyed immediately. For a vegan version, replace egg with flaxseed egg. Try toppings like whipped cream, berries, or caramel.

Author: Casey Morgan
Prep Time: 2 mins
Cook Time: 1 min
Category: Mug Cake
Method: Microwave
Cuisine: American
Diet: Vegetarian

Nutrition

Serving Size: 1 mug cake
Calories: 320
Sugar: 20g
Sodium: 150mg
Fat: 18g
Saturated Fat: 4g
Unsaturated Fat: 12g
Trans Fat: 0g
Carbohydrates: 28g
Fiber: 2g
Protein: 10g
Cholesterol: 70mg

Keywords: peanut butter mug cake, 3 ingredient mug cake, quick dessert