Preheat oven to 375F. Line a baking sheet with parchment paper or a silicone baking mat.

In a medium bowl, whisk together the flour, baking powder, and salt. Add the Greek yogurt and mix with a fork or spatula until it forms small crumbles.

Lightly flour a work surface. Remove dough from the bowl and knead it a few times until tacky but not sticky, about 15 turns.

Divide the dough into 4 equal portions. Roll each into a 3/4-inch thick rope and connect the ends to form bagels or shape into balls with a central hole.

Brush the bagels with the beaten egg white and add optional toppings. Bake on the prepared baking sheet for 25 minutes or until golden brown.