Preheat the oven to 350°F and grease two 6 oz. ramekins.
Melt 1 Tablespoon honey and the butter in a small bowl in the microwave or a small saucepan on the stove. Divide the honey-butter mixture between the ramekins and place one pineapple slice in the bottom of each ramekin.
In a small bowl, mix together the almond flour, oat flour, baking powder, and salt. Add the vanilla, egg, and remaining 2 Tablespoons of honey and stir until combined.
Bake for 16-18 minutes or until set in the middle and a toothpick comes out clean.
Let cool for 5-10 minutes before running a knife around the edge and flipping the cakes out of the ramekins onto a plate.
Oat flour can be purchased or made simply by grinding oats into a powder in your blender.