1 stick (8 tablespoons) unsalted butter, room temperature
2/3 cup sugar
1 teaspoon vanilla
1/4 cup bourbon
1 cup flour
1 teaspoon baking powder
2 apples, peeled, cored and cut into 1/2-inch cubes (i.e. Gala, Granny Smith or mixture)
1/4 cup sparkling finishing sugar
Preheat oven to 350 degrees F.
With a mixer, cream the butter and sugar together until pale and fluffy. Add the eggs, one at a time until incorporated. Add the vanilla and bourbon. In a separate bowl, whisk together the flour, baking powder & salt. Add to the batter and mix in until just combined. Stir in the apple chunks.
Butter a 9 or 10-inch tart pan (you can also use a cake pan). Pour batter into pan and even surface with a spatula. Sprinkle the sparkling sugar on top. Bake for about 40 minutes until lightly golden. Allow to cool before removing from pan.