Preheat oven to 375 degrees Fahrenheit. Grease a 9x13 ceramic or glass baking pan with coconut oil or cooking spray.
In a large bowl, combine spinach, artichokes, bread, and sun-dried tomatoes. Gently stir to combine. Transfer mixture to prepared baking pan. Top with mozzarella cheese, followed by parmesan.
In the same bowl, whisk almond milk, eggs, ground mustard, pepper, salt, onion powder, cayenne, and nutmeg. Pour egg mixture evenly over bread and veggies, coating everything in pan. (Tip: make sure sun-dried tomatoes are either covered with cheese or under other ingredients as they cook up fast if right on top).
Bake for about 35 minutes or until set. Serve immediately. Season with salt and pepper if desired.
Notes
Adapted from Cooking Light and my mom's Christmas casserole.I like to buy the pre-sliced sun-dried tomatoes from Trader Joe's. Makes it quick and easy!