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Export 6 ingredients for grocery delivery
Spray mugs (make sure they are at least 12 oz in size) with cooking spray. Set aside.
In a small bowl or 4 cup glass measure, whisk together the egg and oil.
Whisk in milk, vanilla, and sugar.
Add flour and whisk until batter is smooth.
Pour equally, into prepared mugs.
Microwave them one at a time for 1 1/2 minutes on HIGH.
Test the cake to see if it springs back, if not, put in the microwave for 10 more seconds.
Repeat with second mug.
Allow cakes to cool completely. Serve with whipped topping, if desired.