Air Fryer Donuts Gelson's

Ingredients

• ⅔ cup granulated sugar
• 1 tsp cinnamon
• ¼ cup warm water (100º to 110º)
• 1 tsp active dry yeast
• 2 cups all-purpose flour
• ½ tsp kosher salt
• ¼ cup whole milk, plus 2 Tbsp for the glaze, at room temperature
• 1 large egg, beaten
• 3 Tbsp unsalted butter melted, plus 2 Tbsp for brushing, divided
• 1 cup powdered sugar (sifted)
• ½ tsp vanilla extract