Preheat oven to 350 degrees and spray your bundt pan with baking spray, set aside
Using a standing mixer, combine cake mix, pudding, eggs, sour cream, sugar, oil, key lime juice and vanilla and beat until combined
Mix in the green gel food coloring until combined
Pour into a bundt pan and bake in the oven for 35-45 minutes or until a toothpick comes out clean when poking the center
Allow to cool completely on the counter before removing from the pan