Begin by gathering a large mixing bowl and combine the cottage cheese, olive oil, and egg. Whisk together until smooth and creamy, about 2-3 minutes.

In a separate bowl, whisk together the all-purpose flour, baking powder, and salt until well combined and light.

Gradually fold the dry mixture into the creamy wet ingredients, mixing gently until just combined.

Add the finely chopped spinach and shredded mozzarella cheese to the dough and carefully fold them in.

Shape the dough into bagel-like circles with holes in the center and place on a parchment-lined baking sheet.

Preheat the oven to 400°F (200°C) and bake the flagels for about 15 minutes until golden brown.

Remove the flagels from the oven and let them cool on a wire rack for about 5-10 minutes before serving warm.