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Preheat your oven to the lowest temperature it will register. I use the “warm” setting on mine, and if you have “proof” as an option, that’s even better.
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Place the milk in a microwave-safe container (such as a pyrex measuring cup), and heat the milk for 1-1:45 minutes, depending on the strength of your microwave. You want the milk to be warm to touch but not hot.
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Prepare all your dry ingredients in your mixing bowl. Try to keep the yeast and the salt on opposite sides of the bowl.
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Beat the three egg whites in a separate small container until they are a little frothy. Add the remaining egg, the vegetable oil and apple cider vinegar to the egg whites.
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Once your milk is warm, set your mixer to a low setting, stirring the dry ingredients, and begin slowly pouring in the egg mixture. Once done, quickly switch to gradually adding the milk.
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Once the milk is added and slightly incorporated, stop the mixer, scrape down the sides of the bowl and restart the mixing at a slightly higher speed until the dough is uniform in texture. The “dough” will be very silky and thick, close to muffin batter texture.
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Turn the mixer up to a medium-high speed and beat on medium high for three minutes. This helps activate the xanthan gum, sort of like kneading develops gluten.
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Lightly grease your rimmed cookie sheet. Fill a container with warm water to dip your spatula in. Scrape all of the dough out of the mixing bowl onto the baking sheet.
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Begin spreading the dough out into the corners of the sheet. I find using a technique similar to frosting a cake works well, where you’re not scraping the bottom but trying to always have a cushion of dough between you and the baking sheet at all times. You don’t want any see-through spots. Dip the spatula in the water occasionally to prevent the dough from sticking to it as you spread.
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Once the dough is spread into all the corners and relatively even and flat, push the dough to the sides of the baking sheet so that there is a small ridge around the edge of the pizza. You can define this edge by using your spatula to draw a line about 3/4 inch from the outside edge of the dough. Don’t worry about making it perfect. Irregularity looks delicious once it’s been baked through.
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Place your pizza dough in the warm oven or proofer for 20-minutes to rise.
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Prepare your toppings. I’ve suggested mozzarella, jack cheese, red bell pepper and artichoke hearts, but you can use whatever toppings you like!
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After 20 minutes, take the risen pizza dough out of the oven, and set the oven to preheat at 450 degrees.
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Add a thin layer of sauce evenly across the pizza, leaving the ridge around the edge clear of sauce. You don’t want too much sauce because too much liquid on a gluten-free pizza will make things soggy. Add the rest of your toppings however you like them. I like a very generous layer of cheese in the center and just a little bit of cheese around the edge that will turn crispy and wonderful in the oven, before adding the other toppings.
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Bake at 450 degrees for 13-15 minutes. The crust should be golden brown and the cheese should be bubbling and starting to brown. Cut into squares and enjoy!