Why does my crumble sink?

Chef's answer
the batter had swallowed up the entire amount. it turned out the oven was way off and the baking time was too long. the structure of the cake has to set quickly to hold the crumb topping up. my coffee cake uses sourcream which makes a more acidic batter which also helps to set the structure.
Frequently asked Questions 🎓
What are the best subs for breadcrumbs?
  • Oats. Oats are the perfect substitutes for breadcrumbs in meatballs or meatloaf. ...
  • Crushed Chips. ...
  • Nuts. ...
  • Pretzels or Crackers. ...
  • Crushed Cereal.
  • A-Meatloaves most often crumble when they contain too many bread crumbs or too few eggs or when they have not cooled partially in the fat-filled loaf pan in which they were baked. We suggest adding no more than 1/3 cup of crumbs for each pound of meat and adding 1 egg for each pound of meat plus an extra egg.14 Apr 1988.
    Crushed-up crackers make an excellent bread crumb substitute in baked dishes like meatballs or meatloaf. The crackers work just as well as the bread crumbs to hold the meat mixture together, and using varieties like salty saltines or buttery Ritz is a great way to add an extra burst of flavor to your dish.
    Most meatloaf and meatball recipes include breadcrumbs, stuffing mix, cooked rice or oatmeal. Any of these will work, so you can certainly substitute oatmeal for breadcrumbs, as you'll see in this recipe.
    Cornflakes are classic breading material, but any grain-based, not-too-sweet cereal works great as a stand-in for traditional breadcrumbs.
    Almonds, walnuts, hazelnuts, and chia and flax seeds are all suitable replacements for bread crumbs. And the food processor is your best option to transform them into a powdery consistency. Nut flours burn quicker than bread crumbs, so keep an eye on dinner while it's cooking.
    ? cup regular rolled oats (Use this only as a substitute for bread crumbs in meat loaf and other meat mixtures, such as burgers. Oats won't crisp up nearly as nicely in uses such as casserole toppings and breadings.
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