Step 1

Preheat oven to 350 degrees F (175 degrees C). Grease a 12 cup muffin pan or line with paper baking cups. Combine the soy milk and vinegar in a measuring cup. Let stand for about 5 minutes to thicken.

Step 2

In a large bowl, stir together the peanut butter, oil, sugar, honey, vanilla and flaxseed meal. Mix in the soymilk. Combine the flour, baking powder, baking soda and salt; stir into the batter just until blended. It is okay for the batter to be slightly lumpy. Spoon the batter into the prepared cups, dividing evenly.

Step 3

Bake in the preheated oven until the tops spring back when lightly pressed, 20 to 25 minutes. Cool in the pan set over a wire rack. When cool, arrange the cupcakes on a serving platter. Frost with desired frosting.