In a large bowl, whisk the first 7 ingredients. Stir in the zucchini, baking mix and onion. Pour into a greased 9-in. deep-dish pie plate. Bake at 350° for 25-35 minutes or until lightly browned.
Test Kitchen Tips
If you don't have a deep dish pie plate, feel free to use a small baking dish (8-in. square) or a souffle dish (1-1/2 to 2 quarts). Reduce oven time as needed, baking until lightly browned and eggs have reached an internal temperature of 160 degrees.
For an easy swap-a-roo, use basil or dill in place of the parsley. Dill packs a punch, so you need only 1 teaspoon.