Line a 9-inch square baking dish with foil, leaving a 2-inch overhang on two sides; coat with cooking spray. Melt the coconut oil in a large wide pot over medium heat. Add the marshmallows and cook, stirring occasionally, until melted, about 4 minutes. Stir in the vanilla.
Add the potato chips, cereal and freeze-dried strawberries to the pot and stir to coat. Spread the mixture in the prepared pan and press firmly and evenly with oiled hands. Let cool completely, at least 1 hour.
Lift the bars out of the pan using the foil overhang; discard the foil. Cut into squares.
We used Honey Nut Cheerios and Kix cereal. You can also try fruity ones, like Froot Loops or Trix.