Preheat oven to 350°F (175°C). Grease a 9-inch (23 cm) round baking pan.
In a medium bowl, cream together the butter and sugars until light and fluffy. Add the eggs one at a time and mix until fully incorporated. Add the vanilla extract and mix until well combined.
In a separate bowl, sift together the flour, baking powder, and salt. Add the dry ingredients to the wet ingredients and mix until just combined.
Pour the batter into the prepared pan. Pour the caramel sauce over the top of the batter and sprinkle the biscuit crumbs on top.
Bake for 30-35 minutes until a toothpick inserted into the center comes out clean.
Allow the cake to cool before serving.
Interesting Facts
Caramel Sponge Pie is a classic American dessert that is a delicious combination of caramel, sponge cake, and biscuit crumbs.
This dessert is traditionally served warm, but can be enjoyed at room temperature as well.
Caramel Sponge Pie is a great way to use up leftover cake or biscuit crumbs.