Step 1

Preheat the oven to 350F/180C

Step 2

Line 2 x 4-inch cake tins with baking paper

Step 3

Combine the oat flour and baking powder in a large bowl, whisk to combine

Step 4

Add the carrot, mashed banana, peanut butter and egg to the dry ingredients

Step 5

Mix until just combined

Step 6

Transfer the mixture to the lined cake tins and bake for 25 minutes, or until a toothpick inserted in the center emerges clean

Step 7

Cool completely on a wire rack

Step 8

Combine with yogurt, peanut butter, and cornstarch in a bowl

Step 9

Whisk until smooth

Step 10

Spread the frosting between the two cake layers and over the top, decorate with dog treats if desired!