Step 1

Prepare the Pan - Line a 13x9-inch baking dish with parchment paper or wax paper. This makes it easy to lift out. If desired, lightly coat the liner with nonstick spray or melted butter.

Step 2

Melt the Butter - Melt the sliced butter in a large pot or Dutch oven over medium heat, stirring occasionally. Once melted, immediately reduce the heat to low.

Step 3

Melt the Marshmallows - Add the marshmallows. Use a greased spatula to stir the mixture continuously until just melted, about 3 to 4 minutes. It's okay to have some unmelted pieces. Turn off the heat and move the pan to a cold burner.

Step 4

Add the Cereal - Stir in the vanilla and salt. Quickly stir the cereal in being careful not to crush the pieces.

Step 5

Shape the Treats - Immediately pour the cereal mixture into the prepared baking dish. Gently spread into an even layer using a greased spatula or lightly dampened hands. Do not firmly press down! Let it cool and set for about 1 hour.

Step 6

Slice - Lift the cereal mixture out of the pan and transfer it to a cutting board. Use a lightly greased chef knife to cut into 20 pieces.