Step 1

Lightly grease a 9x13 inch pan with butter or non-stick cooking spray.

Step 2

In a large saucepan melt the butter, mini marshmallows and peanut butter together over low heat while stirring gently.

Step 3

Once melted, remove from the heat and stir in the Rice Krispies.

Step 4

Press the mixture into the pan (lightly spray your hands with non-stick cooking spray to avoid the mixture sticking to your hands).

Step 5

Add the chocolate chips (or chopped chocolate) to a medium-sized heatproof bowl. Microwave for 45-second intervals on medium power (not high or standard), stirring in between each burst.

Step 6

Once almost melted, stir until smooth and stir in the vegetable oil.

Step 7

Pour the chocolate over the top of the bars and let harden at room temperature (about 2 hours).

Step 8

Cut into squares and store in an airtight container at room temperature.