Oatmeal Cookies with Chocolate Frosting

2 sticks salted butter

3/4 cup granulated sugar

3/4 cup firmly packed light brown sugar

2 eggs

1 tsp. vanilla extract

1 1/2 cups all-purpose flour

1 tsp. baking soda

½ tsp. salt

2 cups old-fashioned rolled oats

1 cup coconut (optional)

1 cup semi-sweet chocolate chips (6oz)

2 eggs

1 cup powdered sugar

3/4 cup butter

1/4 tsp vanilla