Apple cider cake layers with shortbread frosting, apple pie filling, streusel filling and vanilla bean buttercream.
Preheat your oven to 350 degrees F. Spray three 8-inch or four 6-inch round pans with nonstick spray, line the bottoms with parchment paper, and spray the parchment. Set aside.
Evenly divide all of the batter between the pans (about 18 ounces of batter in each 8-inch pan or or 12 ounces in each 6-inch pan).
Spread the clusters on a parchment lined sheet pan. Bake for 20 to 25 minutes, breaking them up occasionally and keeping an eye on them toward the 20 minute mark. The crumbs should be golden brown and still slightly moist to the touch at that point; they will dry and harden as they cool.
Cut in the butter to the flour mixture until small clumps have formed. You can also use your hands to create clusters if you need to.