Dice two strawberries and set aside. Cut the stems off of each of the remaining strawberries, forming a base for strawberries to stand on. Starting at the pointed ends and cutting most of the way, but not completely through the stem end, slice each strawberry into four wedges.
Beat the cream cheese until fluffy; stir in the diced strawberries, walnuts, and powdered sugar. Spoon or pipe about a teaspoon of mix into each strawberry.