Steps
1. In a microwave-safe mug, mix together flour, sugar, baking powder, cocoa powder, and espresso powder.
2. Add milk, melted butter, and almond butter to the dry ingredients. Stir until the batter is smooth.
3. Push the chocolate squares into the center of the batter.
4. Microwave on high for about 90 seconds or until the cake rises and is firm in the middle.
5. Let it cool for a couple of minutes before sprinkling sliced almonds on top.