Preheat the oven to 375°F and line a large baking sheet with parchment paper.
Add the cottage cheese, 1 egg and apple cider vinegar to a blender and blend for 30 to 45 seconds until completely smooth and creamy.
In a large bowl, whisk together the almond flour, psyllium husk powder, baking powder and sea salt. Pour in the blended cottage cheese mixture and stir until a thick, sticky dough forms.
Let the dough rest for 10 minutes. This gives the psyllium time to absorb the moisture, so the dough firms up and becomes easy to shape.
Wet your hands lightly and divide the dough into 6 equal portions. Roll each portion into a ball, push a finger through the center and gently stretch the hole to about 1 inch wide.Place the bagels on the prepared baking sheet, leaving 2 inches between them.
Brush the tops with the beaten egg and sprinkle evenly with the sesame seeds.
Bake for 25 to 28 minutes, until the bagels are deep golden brown and feel firm when tapped.
Cool on the baking sheet for at least 15 minutes before slicing. The inside finishes setting as the bagels cool, which gives them that chewy bagel texture.