Pour 1 1/4 cups boiling water over the 1 cup oats, stir to combine, then cover and let stand for 20 minutes.
Meanwhile, in a separate bowl, beat the 1/4 cup butter until creamy. Gradually add the 1 cup sugar and 1/2 cup brown sugar, beating until the mixture is light and fluffy. Blend in the 1 teaspoon vanilla and 2 eggs, then add this mixture to the softened oats and blend well.
In another bowl, sift together the 1 1/2 cups flour, 1 teaspoon baking soda, 1/2 teaspoon salt, 3/4 teaspoon cinnamon, and 1/4 teaspoon nutmeg. Add these dry ingredients to the creamed mixture, along with the 3/4 cup coconut, 1/2 cup nuts, and 3 tablespoons half and half, mixing until just combined and no streaks of flour remain.