Step 1

Grease and flour an 8" round springform pan. Set aside.

Step 2

Preheat oven to 375 degrees F.

Step 3

In a medium bowl, whisk together both sugars, cinnamon, salt and flour. Add melted butter and fluff with fork until mixtures creates crumbs. Set aside.

Step 4

In a medium mixing bowl, whisk together flour, sugar, baking powder, cinnamon, baking soda and salt. In a large measuring cup, mix together milk, vanilla, oil and egg. Whisk until smooth.

Step 5

Add the wet ingredients to the dry ingredients and stir with a wooden spoon. Do not over mix. Few lumps in the batter are okay.

Step 6

Pour the cake batter into the prepared pan.

Step 7

In a medium bowl, toss together apple slices with two tablespoons of sugar, 1/2 teaspoon of cinnamon and the apple cider vinegar. Set aside.

Step 8

Arrange apple slices over the batter.

Step 9

Sprinkle crumb topping over the apples covering completely.

Step 10

Bake the cake for 30 to 35 minutes or until the topping is golden brown.

Step 11

Let cool completely in the pan.

Step 12

Transfer onto a serving plate or stand. Slice and serve.

Step 13

Keep in a covered container for up to 4 days.