Blend the eggs, garlic, water, salt and pepper in a blender until combined and lightly foamy.
Wipe out the skillet you used previously and coat it with a bit of olive oil. Pour in the eggs and add half of the veggies and half of the cheeses. Put the skillet in the oven, and bake for 8-10 minutes, or until the frittata begins to set but is still uncooked on top. Carefully, (without moving the skillet around too much), add the rest of the veggies and the cheeses. Continue to bake for another 10-15 minutes or until the edges of the frittata are golden brown and the eggs are set.
Top with chopped tarragon, a grind of pepper and a few red pepper flakes. Let cool before slicing.
Recipe by Love and Lemons at https://www.loveandlemons.com/spring-onion-asparagus-fritatta/