Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease a 6-cup ring mold or fluted tube pan.
Combine egg, honey, peanut butter, oil, and vanilla in a large bowl; blend well.
Stir in carrots until well-combined.
Sift together flour and baking soda and fold into carrot mixture.
Spoon cake batter into the prepared pan.
Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 40 minutes.
Let cake cool in the pan for 10 minutes, then turn out onto a wire rack to cool completely.
