Line an 8x8' baking dish with wax paper or parchment paper, and thoroughly grease (with butter or spray) any parts of the dish you're unable to cover with paper, or use butter to help the paper stick better to the pan.

Then put your butter into a heavy-bottom pan and turn on your heat to medium-low, warming the butter until fully melted, about 3 minutes (or 5-7 minutes for browned butter).

Turn your heat to low and drop in your marshmallows, and vanilla, and allow them to heat up and melt without heating them too quickly; this will take about 8-10 minutes.

Once your marshmallows are softened and completely melted into the butter (no lumps), then take the pot off heat and move to a cool, heat proof surface, if possible. Then pour in your rice krispies and mix well, until fully coated in the marshmallow mixture.

Finally, grab your chocolate chips from the freezer and pour most of them in, quickly stirring them in completely (some will melt a bit, but that will be fixed in the fridge.

Top the rice krispies treats with chocolate chips (any leftover), and quickly put them in the fridge for 30 minutes (or the freezer for 10, if you're pressed for time). I recommend you set a timer.

Once your timer goes off, pull out your tray of chocolate chip rice crispy treats, and cut them down to your desired size.

Line an 8x8' baking dish with wax paper or parchment paper, and thoroughly grease (with butter or spray) any parts of the dish you're unable to cover with paper, or use butter to help the paper stick better to the pan.

Put your butter, marshmallows, and salt in a very large glass bowl— ideally the biggest one in your home— and then microwave everything on high for one minute.

Then take it out and stir everything well, and immediately put it back in the microwave for another 1 to 2 minutes on high, taking it out every 30 seconds to give it a good stir.

Once the butter and marshmallows have fully melted & combined together, stir in the vanilla and mix until well-combined.

Then add in the rice krispies and stir them until everything has come together.

Finally, pour in your frozen chocolate chips and stir them in well, then pour & press the chocolate chip rice krispies treats into your lined dish. Refrigerate them for 30 minutes (or freeze them for 10 minutes, or just eat them out of the bowl; I don't judge) before cutting them into 12 individual chocolate chip rice krispie treats.