Step 1

Line an 8x8 dish with waxed paper or foil and coat lightly in oil.

Step 2

Add the butter to a pot and melt over medium heat.

Step 3

Once the butter is melted, add the marshmallows and continue to stir and cook until the marshmallows are melted and incorporated into the butter.

Step 4

Once the marshmallows are melted and incorporated, remove the pot from the heat. Stir in the vanilla extract.

Step 5

Add the rice krispie cereal and stir until everything is coated in the marshmallow mixture.

Step 6

Press the rice krispie mixture into the prepared dish using a lightly oiled spatula. Avoid over compacting the treats.

Step 7

Allow the treats to cool at room temperature or in the refrigerator until solid. Slice into 9 pieces and serve.