01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, baking powder, and salt. Cut in cold cubed butter using a pastry cutter or fingers until mixture resembles coarse crumbs.
03 - Pour in cold whole milk and stir just until dough forms. Turn dough onto a lightly floured surface and knead gently 2 to 3 times.
04 - Roll dough into a 10 by 14 inch rectangle.
05 - In a medium bowl, combine shredded cheddar, ricotta, chopped spinach, roasted red peppers, parsley, garlic powder, black pepper, and smoked paprika. Mix well.
06 - Evenly spread the filling over the dough, leaving a 1-inch border along one long edge.
07 - Starting from the opposite long edge, roll dough tightly into a log, pinching the seam to seal.
08 - Place roll seam-side down on the prepared baking sheet. Brush the surface with beaten egg.
09 - Bake for 22 to 25 minutes until the biscuit is golden brown and firm to the touch.
10 - Allow the roll to cool slightly, then slice into 8 pieces and serve warm.