Air Fryer Chocolate Hazelnut Filled Donuts!

5min · 12 servings Ingredients: • 1 cup milk, heated to 110 degrees F • 1/4 cup + 1 tsp. white sugar • 2 and 1/2 tsp. active dry yeast • 1 tsp. salt • 1 large egg, beaten • 8 Tbsp. melted butter, divided • 3 cups all-purpose flour • 1/2 cup white sugar (for coating donuts) • 1/2 cup chocolate hazelnut spread