Prep: 1. In a small bowl, whisk together vegetable oil, milk, egg and vanilla. 2. Add flour, sugar, and cocoa and whisk to combine. 3. Divide chocolate chips between two medium microwave-safe mugs. 4. Pour batter into mugs over chocolate chips. Make: 1. Microwave on high for 90 sec. Check to see if cakes are puffed and bounce back after being lightly touched. If not, microwave for an additional 30 seconds. Serve immediately.