Steps
1. In a microwave-safe mug or small bowl, whisk together flour, brown sugar, baking powder, baking soda, and salt.
2. Add milk, vegetable oil, and yogurt to the dry ingredients and mix until smooth and lump-free.
3. Fold in the chocolate chips gently.
4. Microwave the mixture on high for 60-75 seconds, checking at 60 seconds. The cookie cake should rise and be set but still moist.
5. Let it cool slightly before enjoying your spongy cookie cake.