How to make Baked Cinnamon Donuts

Name: How to make Baked Cinnamon Donuts
Cuisine: American
Ingredients: 180 ml apple juice (3/4 cups); 60 ml milk (1/4 cup); 1 egg; 15 g (1 tbsp.) unsalted melted butter; 125 g all-purpose flour (1 cup); 50 g oat flour (1/4 cup and 1 tbsp.); 1/2 teaspoon baking soda; 1/2 teaspoon baking powder; 1/2 teaspoon ground cinnamon; 1/2 teaspoon gingerbread spice; pinch of vanilla bean powder or dash of vanilla extract; pinch of salt; 50 g brown sugar (1/4 cup); 50 g granulated sugar (1/4 cup); 1/2 tsp. ground cinnamon; 1/2 teaspoon gingerbread spice; 100 g granulated sugar (1/2 cup)