Step 1

Preheat Oven to 350 degrees F. Grease a 9x13-inch pan and set aside.

Step 2

Mix together the topping ingredients in a medium bowl and set aside.

Step 3

Sift the flour, baking powder, baking soda, apple pie spice, and salt together into a medium bowl.

Step 4

Cream the butter and sugar together in a large bowl or stand mixer fitted with a whisk attachment until light and fluffy. Add the eggs one at a time, beating well between additions.

Step 5

Mix in the apple jelly, vanilla, and the minute oatmeal and beat until combined. Add in the dry ingredients, alternating with the sour cream and mixing well between each addition.

Step 6

Pour half of the batter into the prepared 9x13-inch pan, then layer with half of the topping mixture. Cover with the remaining batter and sprinkle the top with the remaining topping mixture.

Step 7

Bake for 40 to 50 minutes until toothpick comes clean from center.

Step 8

Mix the icing ingredients together, adding extra heavy cream or confectioners' sugar to reach desired consistency and drizzle over cake.