Why not set up a make-your-own-cake buffet for your friends? Start with the basic ingredients, and let everyone mix in their own flavorings. My husband Ted voted salty peanut as best of the bunch, with double ginger a close second, and cinnamon walnut great, too. Each mug serves 1, or 2, if you're willing to share.
For the basic recipe:
1 Tbsp butter
2 Tbsp water
1 Tbsp milk (any type; I use nonfat)
1/4 tsp pure vanilla extract
1/4 tsp kosher salt
2 Tbsp granulated sugar
2 Tbsp unsweetened cocoa powder
4 Tbsp all-purpose unbleached flour
For the salty peanut cake, add to the basic recipe:
1/4 tsp coarse sea salt
1 tsp chopped roasted unsalted peanuts
For the double ginger cake, add to the basic recipe:
1/4 tsp powdered ginger
1 tsp chopped crystallized ginger
For the cinnamon-walnut cake, add to the basic recipe:
1/4 tsp cinnamon
1 tsp chopped walnuts
In an 8-oz microwave-safe mug or measuring cup, melt butter in the microwave (20-30 seconds on HIGH).
Stir in the remaining ingredients, including your choice of add-ins, and mix well. Microwave for 60 to 75 seconds on HIGH.
Optional: top with a scoop of vanilla ice cream or whipped cream.