Irish Apple Cake

Ingredients   cake 1/2 cup (1 stick) unsalted butter at room temperature 1/2 cup sugar 2 large eggs 3 Tbsp milk or cream 1 1/4 cups all purpose flour 1 tsp baking powder 1 tsp cinnamon 1/8 tsp salt about 3 Granny Smith apples, peeled and thinly sliced...