Begin by making a powder out of the freeze-dried strawberries. Add the strawberries to a clean coffee grinder or a small food processor. Process the strawberries until a powder forms. It should be a little more than 2 tablespoons of powder.

Heat the butter in a large pot over medium heat. When the butter is melted, add 5.5 cups of the marshmallows. Stir until the marshmallows are melted and there are no lumps.

Remove the pot from the heat and add the 2 tablespoons of strawberry powder and vanilla extract. Stir until combined and until the marshmallows turn pink.

Fold the rice krispies into the marshmallows and gently stir until the rice krispies are coated in marshmallows. Fold in the last cup of mini marshmallows.

Pour the mixture into a lined 8x8-inch pan. Evenly spread the rice krispie treats in the pan. Do not firmly press the mixture down. Top with additional freeze-dried strawberries.

Let them set for about 20 minutes before slicing.