Here is the essential "Carvel" Crunchies recipe for our budget minded Ice Cream Cakes....

Sorry it's in Grams, but I think 50 grams is similar to 1/4cup.
Chocolate Streusel
50 grams unsalted butter
50 grams sugar
50 grams almond flour (finely ground almonds..just put in spice grinder)
40 grams flour
10 grams cocoa powder
pinch of salt
Cream all ingredients together until a ball forms. Wrap in plastic wrap and freeze until it hardens. When it is solid, grate it with a large grater or even through a food grinder. You will get little pieces of streusel. Refrigerate right away.
When the pieces of streusel are hard again, spread them on a sheetpan and bake in a 350 degree oven for about 12 minutes. Let the streusel cool and store in an airtight container until ready to use.