The cake had a crumblike texture.

She baked the cookies crumbily.

The crumbiness of the cake made it difficult to eat.

I sprinkled bread crumbs on top of the casserole.

I ate three pieces of crumpet for breakfast.

I had a few bits of crumpet for breakfast.

This crumbless cookie is perfect for those who don't like a mess.

The cookies were crumblable, so they easily broke apart.

I found a crumblet on the kitchen counter.

She held the old book crumblingly in her hands.