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Whisk egg, sugar, cocoa powder, butter, vegetable oil, and salt together in a bowl until smooth.
Stir in optional mix-ins
Whisk in milk.
Place flour into a small bowl or measuring cup and stir baking powder into flour with a mini whisk or fork. Pour flour mixture over batter and whisk just until you can't see visible flour.
Divide batter evenly between 2 coffee cups. Gently tap the cups on a work surface to eliminate air bubbles.
Place cups into a microwave oven, one at a time. Microwave each cup on high for 45 seconds.