Preheat your oven to 350°F. Spray a 9-inch x 5-inch bread pan with gluten-free cooking spray.
In a large mixing bowl, combine gluten-free flour, baking powder, and instant yeast. Stir well.
Add olive oil, honey, apple cider vinegar, and warm water to the dry mixture. Mix with an electric mixer on low speed for about one minute.
Add egg whites and salt. Increase mixer speed to medium and mix for another minute until dough resembles thick cake batter.
Transfer the dough to the prepared bread pan, smoothing the top. Cover with plastic wrap sprayed with cooking spray and let rise in a warm area for 30 minutes.
Bake for 30 minutes until golden brown and internal temperature reaches 205-210°F.
Cool in the pan for 10 minutes, then remove and place on a cooling rack until completely cool before slicing.
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Notes
Store at room temperature for up to 3 days; freeze for longer storage.