Apple Coffee Cake

Name: Apple Coffee Cake
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: American
Ingredients: 1/4 cup all-purpose flour; 1/4 cup brown sugar; 1 1/2 teaspoons cinnamon; 2 tablespoons melted butter; 1 cup all-purpose flour; 1/2 teaspoon baking soda; 1/2 teaspoon baking powder; 1/2 teaspoon salt; 2 teaspoons cinnamon; 1/4 cup room temperature butter; 1/2 cup brown sugar; 1 large egg (room temperature); 1/2 cup vanilla or plain yogurt ((sour cream works too)); 1 teaspoon vanilla extract; 1 teaspoon apple extract ((optional)); 2-3 cups apple diced into very small pieces ((any favorite apple will work)); 1/4 cup confectioners' sugar; 1 to 2 teaspoons milk