1. Preheat oven to 400 degrees F (200 degrees C). 2. Place butter in a cast iron skillet. Place skillet in the preheating oven until butter melts, about 5 minutes. 3. Combine eggs and milk in a bowl; whisk until combined. Whisk in tapioca flour, coconut flour, lemon juice, lemon zest, and sea salt until combined. Fold blueberries into the batter. 4. Remove skillet from oven using a pot holder or kitchen towel. Spread melted butter with a pastry brush to coat skillet evenly; pour in batter. 5. Bake in the preheated oven until middle is firm and top is golden brown, 18 to 20 minutes. Slice and drizzle with maple syrup. ---------------------------------------------------------------------------
Nutrition
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