In a large pot, melt the butter over medium-low heat. Stir so it doesn't brown.

Add the marshmallow creme and softened cream cheese. Stir until smooth and creamy. Turn the heat down if needed.

Stir in the vanilla and salt. The mix should smell sweet and a little tangy.

Turn off the heat. Pour in the Rice Krispies and mix until everything is well coated.

Line a square pan with parchment or spray with nonstick spray. Press the mix into the pan gently—don’t pack it too tightly.

Let the treats cool on the counter for 30 minutes. For firmer bars, chill in the fridge for 1 hour.

Add crushed graham crackers or drizzle with melted white chocolate if you like. Slice and enjoy!