Line a 9 x 13 inch baking dish with foil and coat it with cooking spray. I used parchment, either works great. Set aside.

In a large bowl, combine the Rice Krispies, oats and pretzels. Set aside.

In a small saucepan, combine the brown sugar and corn syrup and bring to a boil over medium heat, stirring frequently. Remove from the heat and stir in the peanut butter and vanilla.

Pour the peanut butter mixture over the cereal-pretzel mixture and stir until evenly coated. Pour all of this into the prepared pan and press down to make level. Immediately press the mini M&M’s into the top.

Allow to cool completely before cutting into squares.