Method:
Preheat oven to 350°F. Line 12 muffin tins with paper liners.
Mix the cane sugar with flour, cocoa, baking powder, baking soda and salt. In a separate bowl, whisk together the egg, milk, melted butter and vanilla. Pour liquid ingredients into the dry and beat with a wire whisk for 2 minutes. Add boiling water and beat for another 2 minutes.
Scoop batter into lined muffin tins. Place 1/2 to 1 teaspoon jam in the center of each cupcake. Bake for 25 minutes or until done when tested with a toothpick.
When completely cool, dust the cupcakes with confectioner's sugar, if desired.