In a word: yes. As long as you are making a crustless quiche and watching for hidden carbs in the items you are adding you can make a keto quiche. To keep your carb count low, be sure to stick to a filling of eggs, protein, cheese, and naturally low-carb veggies. Watch for hidden sugars in your protein choices, such as maple flavored bacon or sausage. And be sure to read the label on your cheese selection.