Preheat oven to 400 degrees F. Lightly grease a cookie sheet.
In a large bowl, beat together the butter, brown sugar, sour cream, vanilla extract, and the egg with a spoon. Stir in flour, baking soda, and baking powder. Stir in dates and nuts.
Drop dough by teaspoonfuls onto the prepared cookie sheet. Bake approximately 10 minutes or until golden brown. Remove from oven and remove from cookie sheet to a wire rack to cool completely, about 1 hour.
Prepare Vanilla Frosting. Over the top of the cooled cookies, spread with the Vanilla Frosting.
Yields 4 dozen cookies.
In a 2-quart saucepan over low heat, melt butter; remove from heat. Stir in powdered sugar and vanilla extract until blended. Stir in hot water, 1 tablespoons at a time, until frosting is smooth and spreadable.
Frosted Date Cream Cookies Recipes: https://whatscookingamerica.net/cookie/frosteddatecreams.htm