My favorite add in for this Keto Carrot Cake recipe is chopped pecans. Pecans add protein to this cake recipe which is great on a Keto diet. Also, I love the flavor and texture it adds to the cake as well. However, if you don't love pecans, you can use chopped walnuts or almonds instead. Also, if you're not a fan of nuts in your desserts, feel free to just leave them out. The cake will still taste great.