White Chocolate Cereal Treats with M&M's

4 Tbl. unsalted butter

1/2 c. white chocolate chips

1 (10 oz.) bag mini marshmallows

6 1/2 c. Rice Chex or Rice Krispies

1 cup M&M's, or more to taste

Add butter and white chocolate chips to a large saucepan.  Stir until melted.  Add the marshmallows and stir until just melted.  Remove from heat and stir in 3 cups of cereal and stir to coat.  Add remaining cereal and M&M's and fold together until everything is coated in melted marshmallows.  If it is too sticky for your taste, add another 1/2 cup of cereal.  Lightly press mixture into a well-greased 9x13-inch pan.  Allow to set and cut into squares and serve.  

Recipe printed from: Eat Cake For Dinner, adapted from: Something Swanky