Preheat oven to 350°F.
Melt ½ cup butter on medium heat in an oven-proof skillet.
Add golden sugar and stir to melt. Take the pan off the heat and stir in Hedessent Vanilla Bourbon Flavour Drops.
Arrange rhubarb on top of the sugar mixture.
Beat together remaining butter and sugar until fluffy and pale in colour, about 3 minutes. Add in eggs one at a time, beating in between each addition.
Stir together flour and baking powder in a separate bowl.
In another small bowl, stir together milk and Hedessent Bergamot Flavour Drops.
Add half the flour and half the milk to the butter-egg mix and beat to combine.
Beat in the remaining flour and milk to make a smooth batter. Pour batter evenly over the rhubarb.
Bake for 30 to 40 minutes or until a toothpick comes out clean when the cake is poked in the center.
Let the cake rest 5 minutes. Run a sharp knife around the edges of the pan to loosen cake. Place a large plate on top of the skillet and carefully turn pan upside down, flipping cake onto the plate.
Arrange any of the fruit or sugar that may have stuck to the pan on top of the cake. Cut to serve and enjoy!