Preheat oven at 350F°. Grease and lightly dust a 9” x 13” cake pan with flour, tapping off any excess. Set aside.
In a small bowl combine flour, brown sugar and butter and mix together with a pastry blender or fork until butter is the size of peas. Set aside.
In a small bowl combine apple slices with a splash of lemon juice. Toss with sugar and cinnamon and set aside.
In a medium bowl stir together flour, baking powder and baking soda.
In a large bowl with an electric mixer cream butter and sugar on low speed. Stir in eggs one at a time. Add in vanilla. Gradually add in flour mixture, alternating with some of the sour cream until all blended.
Pour into prepared cake pan. Stick apples lightly into top of dough. Sprinkle with crumb topping.
Bake in preheated oven for 45 to 50 minutes until it pulls away from the side of the pan.
Cool on rack.
In a medium saucepan combine butter, brown sugar and half and half. Stir occasionally over medium heat until butter is melted and sugar is dissolved. Bring to a boil and stir frequently for 2-3 minutes. Remove from heat and stir in salt.
Use to drizzle on top of cake when serving.
Apple Crumb Kuchen - https://www.bakedbyrachel.com/apple-crumb-kuchen/