Gluten Free Doughnuts

Ingredients

• 1 ¹/₄ cups Bob's Red Mill 1 to 1 gluten free flour
  
• ¹/₄ cup flaxseed meal
  
• ¹/₄ teaspoon baking soda
  
• ¹/₄ teaspoon cream of tartar
  
• 1 ¹/₂ teaspoons baking powder
  
• ¹/₄ teaspoon salt
  
• ²/₃ cup sugar
  
• 8 tablespoons unsalted butter, melted and cooled
  
• 1 teaspoon vanilla
  
• 2 eggs whites separated
  
• 1 cup milk (I used coconut)
  
• 2 cups powdered sugar
  
• 2-5 tablespoons milk (I used coconut)