Preheat the oven to 375°F and position the rack to the top position. Line a large baking sheet with parchment paper.
Blend the cottage cheese in a food processor or blender until smooth, scraping down the sides as needed.
Transfer the blended cottage cheese to a medium bowl and add the flour. Mix until fully combined and the dough starts to pull away from the sides of the bowl.
Transfer the dough to a floured surface and knead 8-10 times, until smooth. Add extra flour to prevent sticking if necessary.
Roll the dough into a ball and divide it into four equal portions (around 80g each).
Roll each portion into a 6-7 inch rope, about 1-inch thick, and join the ends to form a circle. Pinch the seams tightly to seal.
Brush each bagel with the beaten egg and sprinkle with your desired toppings.
Bake for 25-30 minutes until puffed and golden brown. Allow to cool for 15 minutes before slicing.
Air Fryer Option: Preheat to 350°F for 5 minutes. Spray the basket with nonstick spray and air fry for 10-12 minutes until golden brown.