In the bowl of a stand mixer, combine the bread flour, instant yeast, and granulated sugar. Stir with a spoon to blend. Add the salt to the flour mixture and stir again. Add the eggs, warm milk, vanilla extract, and melted (but cooled) butter to the bowl. Attach the dough hook and mix on low speed until the dough comes together.
Increase the speed to medium and knead for 8 to 10 minutes, or until the dough is soft, smooth, and elastic.
Cover the bowl with plastic wrap or a clean towel. Let it rise in a warm spot for 1 to 2 hours, or until it doubles in size.
In a medium mixing bowl, combine the room-temperature butter, brown sugar, cinnamon, and Biscoff spread. Mix until a smooth, spreadable filling forms. If the Biscoff is too thick, warm it in the microwave for 10 seconds. Once the dough has doubled, gently punch it down to release the air. Transfer the dough to a lightly floured surface and roll it into a large rectangle about ¼ inch thick.
Spread the filling paste evenly over the rolled dough from edge to edge. Starting from the long side, tightly roll the dough into a log.
Use a sharp knife or unflavored dental floss to slice the log into even rolls about 1 ½ inches thick. Place the rolls into a greased or parchment-lined 9x13-inch baking pan, leaving a little space between each one.
Cover the pan loosely and let the rolls rise for 30 to 45 minutes until they look puffy. Meanwhile, preheat your oven to 180°C (350°F).
Bake the rolls for 20 to 25 minutes until they are lightly golden on top. Do not overbake them or they will lose their gooey center.
While the rolls cool slightly, make the frosting: beat the softened butter and cream cheese until smooth, then mix in the vanilla, salt, powdered sugar, and Biscoff spread until creamy.
Frost the warm rolls generously so the icing melts slightly into the layers.
Drizzle extra melted Biscoff spread on top and finish with a sprinkle of crushed Biscoff biscuit crumbs.