Preheat oven to 375 degrees F. Position rack in upper third of oven. Line a large baking sheet with parchment paper or a silicone baking mat.Advertisement
Shape dough into a disk, then divide into 4 equal pieces. Using your hands, roll each piece into a rope, 9 to 10 inches long and 3/4 inch wide. Shape each rope into a bagel and place on the prepared baking sheet. Blend egg and water with a fork in a small bowl. Brush the egg mixture over the bagels. Sprinkle with sesame seeds, poppy seeds, minced onion and/or minced garlic, if desired.
Bake in the upper third of the oven until nicely browned on the bottom and lightly browned on top, about 25 minutes. Let cool completely before serving.
To make ahead: Store bagels in an airtight container or wrap individually and freeze for up to 3 months.