Preheat the oven to 325 degrees Fahrenheit (170 degrees Celsius). Grease a 10- or 12-cup Bundt pan with cooking spray.

Slice the pears very thin (I like to use the slicing attachment of a food processor). Place them in a bowl. Add the vanilla sugar, lemon juice, and cinnamon, and let sit for 20 minutes.

To make the cake batter, mix together the oil and sugar in the bowl of a standing mixer with the whisk attachment. Add the remaining ingredients and mix until combined.

Pour one cup of the batter into the bottom of the prepared Bundt cake pan.

Layer about half the bag of Crispy Crumbs on top.

The batter will be thick, so slowly pour on another thin layer of the batter.

Add the pears and then another thin layer of batter.

Add the rest of the crumb topping and cover with the final layer of batter (each layer can be quite thin; it gets thicker as it bakes).

Bake in the center of the preheated oven for one hour.

Remove the cake to a wire rack. Let the cake sit in the pan for about five minutes and then turn upside down onto a plate, removing the Bundt pan. Let cool completely.

Combine icing ingredients and pour over the top of the cake.