Spray a 9x13" baking dish with cooking spray. Preheat the oven to 350º Fahrenheit.
In a large bowl, mix together all of the cake ingredients. Mix using a hand mixer on low speed until combined, scraping the sides of the bowl as needed, then mix on medium speed for 1-2 minutes.
Pour the batter into the prepared pan and spread evenly.
Sprinkle the brown sugar and nuts evenly on top of the batter.
Bake for 40-45 minutes until the cake tests done.
Prepare the coconut frosting by melting the sugar, milk and butter in a small saucepan over medium low heat. Stir and bring to a boil. Boil for two minutes.
Remove the pan from the heat and allow the mixture to cool for 15 minutes.
Then mix in the shredded coconut.
Spread the topping on the cake.
Serve with whipped cream.
The calories shown are based on the cake being cut into 15 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**