Line 8x4 loaf pan with non-stick foil.
Combine sugar, butter, evaporated milk in a heavy saucepan.
Bring to a boil, stirring constantly till temperature reaches 234º.
Remove from heat and stir in vanilla, peanut butter and marshmallow creme.
Mix smooth and pour into prepared pan and smooth with off-set spatula.
Cool just a few minutes so not too hot and then sprinkle on mini peanut butter cups.
Cool to room temperature, then cut into squares to serve.
Freezes well too!