Preheat & Prep: Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper or a silicone baking mat.
Mix Dry Ingredients: In a large bowl, whisk together flour, baking powder, and salt. If making cinnamon bagels, add 2 tsp cinnamon.
Incorporate Yogurt: Stir in Greek yogurt using a spatula until a dough forms. Then, knead it together with your hands.
Shape the Bagels: Lightly flour a work surface. Divide the dough into 4 equal portions. Roll each into a ball, slightly flatten, and create a hole in the center using a spoon handle or by rolling into a log and connecting the ends.
Egg Wash & Toppings: Whisk the egg and brush each bagel with it. Sprinkle with your preferred toppings.
Bake: Arrange bagels on the prepared baking sheet and bake for 22-25 minutes, until golden brown on top.
Cool & Serve: Let them cool before slicing and serving. Enjoy!