Prepare the Yeast: Warm the milk until comfortably warm, not hot. Stir in the yeast and granulated sugar. Let the mixture sit for about 5 minutes, until it becomes foamy.
Make the Dough: Add the eggs and melted butter to the yeast mixture. Gradually add the flour and salt, mixing until a soft dough forms. Knead the dough for about 6–8 minutes, until smooth and elastic. The dough should be soft and slightly tacky.
Let the Dough Rise: Place the dough in a lightly greased bowl and cover it with a clean kitchen towel or plastic wrap. Let it rise in a warm, draft-free place for about 1 hour, or until it has doubled in size.
Roll Out the Dough: Gently punch down the risen dough and transfer it to a lightly floured surface. Roll it into a large rectangle, approximately 14 x 18 inches.
Add the Biscoff Filling: Spread the softened butter evenly over the dough. Spread the Biscoff cookie butter over the butter, then sprinkle the brown sugar, cinnamon, and crushed Biscoff cookies evenly across the surface.
6Roll and Slice: Starting from one long side, tightly roll the dough into a log. Using a sharp knife or unflavored dental floss, cut the log into 12 evenly sized rolls. Arrange the rolls in a greased 9x13-inch baking dish.
Second Rise: Cover the baking dish and let the rolls rise for about 30 minutes, or until they look noticeably puffy and expanded.
Bake Until Golden: Preheat the oven to 350°F. Bake the cinnamon rolls for 23–27 minutes, or until the tops are lightly golden and the centers are cooked through. Avoid overbaking so the rolls stay soft and gooey.
Make the Biscoff Frosting: While the rolls bake, beat the softened cream cheese and butter until smooth. Add the Biscoff cookie butter, powdered sugar, and vanilla extract. Beat until creamy, adding milk or heavy cream a little at a time until the frosting reaches your preferred consistency.
Frost and Serve: Let the cinnamon rolls cool for a few minutes after baking. Spread the Biscoff cream cheese frosting generously over the warm rolls. For extra Biscoff flavor, drizzle warmed cookie butter over the top and sprinkle with crushed Biscoff cookies. Serve warm and enjoy!