Blend the cottage cheese, Greek yogurt, vanilla protein powder, cookie butter, maple syrup, vanilla, and salt until completely smooth.
Dip 8 speculoos cookies briefly into the cold brew coffee and arrange them in a single layer in an 8-inch square dish.
Spread one-third of the cottage cheese mixture over the cookies.
Repeat the cookie and filling layers two more times, ending with the cottage cheese mixture.
Cover the dish and refrigerate overnight, or for at least 8 hours, so the cookies become soft and cake-like.
Warm the remaining cookie butter until pourable and drizzle it over the chilled cake.
Sprinkle with crushed speculoos cookies before slicing and serving.