Whisk together the 1 ½ cups whole wheat flour, 1 cup packed light or dark brown sugar, ¼ cup unsweetened cocoa powder, 1 teaspoon baking soda, abd ½ teaspoon fine sea salt. Stir in the ⅓ cup oil, 1 teaspoon vanilla extract1 teaspoon apple cider vinegar, and 1 cup water until smooth.
Preheat oven to 350℉. Divide the batter evenly between the cupcake cups and let the batter rest while the oven heats. Bake for about 20-25 minutes, until a tester inserted in the middle of a cupcake comes out clean.
Remove from oven and cool in pan for 5 minutes, then turn out onto a rack to cool completely.
Notes
Cool completely before frosting. Resist frosting any cake or cupcakes before they've fully cooled! Let these cupcakes come to room temperature or pop them in the fridge for a bit before adding the frosting.
Add a little almond flour. To make these cupcakes extra-moist and fudgy, replace ¼ cup of the oat flour with almond flour.
Try coffee. For a rich depth of flavor, similar to my oat flour chocolate cake recipe, swap the water for coffee.
Refined sugar-free. Substitute coconut sugar for the brown sugar for a natural sweetener option.
Make it a cake. This recipe bakes up beautifully into an 8-inch cake layer. Double the recipe for a double-layercake.
How to finish: See frosting suggestions below, or leave them plain for a quick treat. You can also dust them with a little sifted powdered sugar.