Step 1: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper. In a small bowl, whisk one large egg with 1 tablespoon of water to create an egg wash, and set aside.
Step 2: In a large mixing bowl, combine 1 cup of plain Greek yogurt and 1½ cups of self-rising flour. Mix with a sturdy spoon or spatula until a shaggy dough begins to form.
Step 3: Turn the dough out onto a lightly floured surface. Knead gently for about 5-8 minutes until the dough becomes smooth and elastic, but still slightly tacky. Add small amounts of flour if too sticky, or a tiny splash of yogurt if too dry.
Step 4: Divide the dough into 4 equal portions.
Step 5: Roll each portion into a rope about 8-10 inches long. Connect the ends of each rope to form a circle, pinching firmly to seal the seam, or poke a hole in the center of each dough ball and gently stretch it to create the bagel shape. Ensure the hole is approximately 1 inch in diameter.
Step 6: Place the shaped bagels on the prepared parchment-lined baking sheet.
Step 7: Brush each bagel generously with the egg wash.
Step 8: Sprinkle your chosen toppings evenly over each bagel, gently pressing them to adhere to the egg wash.
Step 9: Bake for 20-25 minutes, or until the bagels are golden brown and sound hollow when tapped on the bottom.
Step 10: Transfer the baked bagels to a wire rack to cool slightly before slicing and serving.