Step 1

Whisk together milk, butter, sugar, and vanilla extract in a bowl.

Step 2

Blend in flour and baking powder until smooth.

Step 3

Pour the batter into a microwave-safe mug, leaving space from the top to keep the batter from overflowing as it cooks.

Step 4

Microwave on high for 1-2 minutes.

Step 5

Whisk together all ingredients for the glaze and drizzle over the mug cake.