01 - In a large bowl, combine flour, sugar, yeast, and salt. Whisk together until evenly distributed.
02 - Add warm milk, warm water, melted butter, and egg to the dry ingredients. Mix with a wooden spoon or stand mixer until a shaggy dough forms.
03 - Turn dough onto a lightly floured surface and knead for 8-10 minutes until smooth and elastic. Alternatively, use a stand mixer with dough hook for 6-7 minutes on medium speed.
04 - Place dough in a lightly greased bowl, turning once to coat. Cover with plastic wrap or a clean towel and let rise in a warm, draft-free area for 1 hour or until doubled in size.
05 - Punch down risen dough and transfer to a floured surface. Roll into a 16x12-inch rectangle, ensuring even thickness throughout.
06 - In a small bowl, mix softened butter and Biscoff spread until creamy and well combined.
07 - Spread filling evenly over the dough rectangle, leaving a small border at the edges. Sprinkle brown sugar and cinnamon mixture uniformly across the surface.
08 - Starting from the long edge, roll dough tightly into a log. Using unflavored dental floss or a sharp knife, slice into 12 equal rolls.
09 - Arrange rolls in a greased 9x13-inch baking dish, cut side up. Cover loosely and let rise for 45-60 minutes until puffy and nearly doubled.
10 - Preheat oven to 350°F during the final 15 minutes of the second rise.
11 - Bake for 22-25 minutes until golden brown on top and cooked through. The internal temperature should reach 190°F when fully baked.
12 - While rolls bake, whisk melted Biscoff spread, powdered sugar, and 2 tbsp milk in a bowl until smooth. Add additional milk 1 tsp at a time if needed to achieve drizzling consistency.
13 - Remove rolls from oven and let cool for 5 minutes. Drizzle warm glaze evenly over the rolls. Serve immediately while still warm for optimal texture.