01 - Combine flour, sugar, yeast, and salt in a large mixing bowl.
02 - Add warm milk, warm water, melted butter, and egg to the dry ingredients. Mix until a shaggy dough forms.
03 - Knead on a floured surface for 8-10 minutes, or use a stand mixer with dough hook for 6-7 minutes, until smooth and elastic.
04 - Place dough in a greased bowl, cover, and let rise in a warm place for 1 hour or until doubled in size.
05 - Punch down dough and roll out on a lightly floured surface to a 16x12-inch rectangle.
06 - Mix softened butter and Biscoff spread until creamy. Spread evenly over the dough rectangle.
07 - Sprinkle brown sugar and cinnamon evenly over the Biscoff mixture.
08 - Roll up tightly from the long edge. Slice into 12 equal rolls.
09 - Arrange rolls in a greased 9x13-inch baking dish. Cover and let rise for 45-60 minutes until puffy.
10 - Preheat oven to 350°F.
11 - Bake rolls for 22-25 minutes, or until golden brown and cooked through.
12 - Whisk melted Biscoff spread, powdered sugar, and 2 tbsp milk until smooth. Add additional milk if needed for drizzling consistency.
13 - Drizzle glaze over warm rolls and serve immediately.