Spray a 9×13 glass baking pan with cooking spray. Set aside.
In an electric or stand mixer add the flour, salt, sugar, baking powder, milk, eggs, and vanilla. Once combined well, slowly stir in the melted butter. Pour into the prepared 9×13 baking pan.
Topping
In a large bowl, cream butter, brown sugar, flour and cinnamon together until well combined and creamy. Drop evenly over the batter by the tablespoonfuls and use a knife to marble/swirl through the cake.
Bake at 350 for 35-40 minutes or when a toothpick inserted near the center comes out nearly clean.
Glaze
In a medium bowl, mix the powdered sugar and International Delight until desired consistency. Drizzle evenly over the warm cake. Serve warm or at room temperature.
Gluten Free
Replace the flour with your Gluten Free All Purpose Flour Mix.