Step 1

Whisk together flour, sugar, cinnamon powder, and baking powder in a bowl.

Step 2

Stir together milk, butter, and vanilla extract until smooth.

Step 3

Mix wet ingredients with dry ingredients

Step 4

Fold in the diced apples into the batter.

Step 5

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

Step 6

Microwave on high for 1-2 minutes.

Step 7

Whisk together powdered sugar and milk in a bowl. Drizzle over mug cake.