For a stronger mint flavor, increase the peppermint extract to 3 teaspoons, tasting as you go. If you have picky eaters who are unsure about mint, start with just 1 teaspoon and let them warm up to the flavor. To make the green color more pronounced, you can stir a drop or two of green food coloring into the warm sweetened condensed milk before adding the chocolate chips (this doesn’t change the ingredient count if you think of it as optional). If you prefer a darker, less sweet fudge, swap half of the semisweet chocolate chips for dark chocolate chips. For a softer, creamier texture, reduce the total chocolate chips to 2 1/2 cups instead of
3. You can also make these in a 9x9-inch pan for slightly thinner pieces that go further at big family gatherings. Store the fudge in an airtight container in the fridge for up to a week, or freeze in layers separated by parchment for up to 2 months—handy if you like to be ready when your mother-in-law “requests” them at the last minute.