Step 1: Prepare the Pan

1. Grease a 9×13-inch baking dish with butter or non-stick spray to ensure the bars come out easily once set.

Step 2: Make the Cherry Layer

1. In a medium saucepan over medium heat, combine the granulated sugar, evaporated milk, salt, marshmallows, and unsalted butter. Stir continuously until the mixture reaches a gentle boil.
2. Once boiling, continue to cook for 5 minutes, stirring frequently to prevent burning.
3. Remove the saucepan from heat and add the cherry chips (or the prepared substitute) and vanilla extract. Stir until the mixture is smooth and the chips are fully melted.
4. Pour the cherry mixture into the prepared baking dish, spreading it evenly. Allow it to cool and set.

Step 3: Prepare the Chocolate-Peanut Layer

1. In a double boiler or a heatproof bowl set over a pot of simmering water, melt the semi-sweet chocolate chips, stirring occasionally until smooth.
2. Add the creamy peanut butter to the melted chocolate and stir until fully combined.
3. Fold in the crushed salted peanuts, ensuring they are evenly distributed throughout the mixture.

Step 4: Assemble the Bars

1. Once the cherry layer has set, pour the chocolate-peanut mixture over it, spreading it evenly to cover the entire surface.
2. Refrigerate the assembled bars for at least 2 hours, or until fully set.

Step 5: Serve

1. Once the bars have set, cut them into squares and serve chilled. Store any leftovers in an airtight container in the refrigerator.