Mix the Dry Ingredients: In a microwave-safe mug, whisk together the flour, peanut butter powder, cocoa powder, sugar, baking powder, and salt.
Add the Wet Ingredients: Stir in the milk, oil, and vanilla extract until smooth and fully combined.
Optional Add-In: For a gooey center, press a tablespoon of chocolate chips or a small dollop of peanut butter into the middle of the batter.
Cook in the Microwave: Microwave on high for 60-90 seconds, depending on your microwave’s power. Start with 60 seconds and add 10-second increments as needed. The cake should rise and look set but still moist.
Cool & Serve: Let the cake cool for 1-2 minutes before enjoying. Top with whipped cream, more chocolate chips, or a drizzle of rehydrated peanut butter powder for extra flavor.
