Melt the butter in a large pot over low heat.
Add the mini marshmallows and stir until smooth.
Turn off the heat.
Fold in the crisp rice cereal and vanilla extract.
Stir fast so everything gets coated before the mixture starts setting.
Press the mixture into a greased 9x13-inch pan.
Use buttered hands or a buttered spatula and press gently.
Let the pan cool for 30 minutes.
Cut with a star cookie cutter.
Melt the white candy melts or white chocolate.
Dip one side of each star halfway into the coating.
Set the stars on parchment paper.
Sprinkle with red white and blue jimmies before the coating sets.
Let them firm up for about 20 minutes.