Cinnamon Roll Cake

Name: Cinnamon Roll Cake
Cuisine: American
Ingredients: 3 cups flour; 1/4 tsp salt; 1 cup sugar; 4 tsp baking powder; 1 1/2 cups milk; 2 eggs; 2 tsp vanilla; 4 tablespoons butter, melted; 1 cup unsalted butter, softened (equivalent to 2 sticks); 1 cup brown sugar; 1 tablespoon ground cinnamon; 2/3 cup nuts (optional, such as walnuts or pecans); 2 cups powdered sugar; 4–5 tablespoons milk; 1 teaspoon vanilla