Preheat oven to 350 degrees.

Mix flour, baking powder and salt in a mixing bowl.

Beat butter and sugar til fluffy. Beat in eggs and vanilla.

Stir in apples and liqueur.

Spray a 9 X 9 " baking pan or 9" Bundt pan. Pour mix into pan and bake 35-40 minutes.

Mix sugar and cornstarch together.

Pour cream into a saucepan.

Use a couple of tablespoons of the cream to dissolve the sugar and cornstarch. Add mixture to the cream in saucepan.

Bring mixture to a boil, stirring frequently.

Cook a few minutes further after it comes to a boil and starts to thicken. Stir in liqueur. Remove from heat and transfer to a serving jug.

Allow cake to cool when done. Drizzle cake with some cooled sauce. Cut into serving size pieces and serve with more sauce on the side.