Coconut Cream Pie

5 tablespoons cornstarch
1 cup sugar
1/4 teaspoon salt
2 1/2 cups milk
3/4 cup half and half
3 egg yolks
2 tablespoons butter
1 teaspoon vanilla

Mix cornstarch, sugar, and salt in medium saucepan. Add milk and cream. Cook on medium heat until smooth and thick stirring constantly. Mix a small amount of the hot mixture into the egg yolks in a small bowl. Add the eggs to the rest of the mixture in the pot and cook 2 more minutes. Remove from heat and add butter and vanilla. Add flaked coconut to taste. Pour cream mixture into a baked pie shell and chill completely. Serve with whipped cream.