Preheat oven to 200 degrees and spray a 12-cavity nonstick muffin tin with cooking spray.
Put the first 9 ingredients (from the cottage cheese to the hot sauce) in a blender and process until smooth.
Pour egg mixture into prepared muffin tin, filling almost to the top (egg bites won't rise much as they cook). Top evenly with chopped mushrooms and kale.
Place muffin tin in oven and cook for 70-75 minutes, until egg bites are set in the middle and are starting to turn golden.
Let rest for a couple minutes and then lightly run a knife along the edge of each egg bite to remove from tin.
Egg bites can be stored in an airtight container in the fridge for up to 4 days. They can easily be heated up in the microwave or oven.