Preheat the oven to 300 degrees F (150 degrees C). Line a baking sheet with parchment paper and set aside.
Beat egg whites and cream of tartar in a large bowl until stiff peaks form. Stir together mashed avocado and egg yolks. Gently fold into egg whites.
Drop 1/4 cupfuls of the mixture onto the prepared baking sheet, about 1 inch apart. Smooth out and sprinkle evenly with bagel seasoning
Bake in the preheated oven until bottom starts to brown and top is firm to the touch, 30 to 35 minutes. Let rest at least 30 minutes. Remove with a spatula.
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