Preheat the oven to 375°F. Line a 10x15-inch rimmed baking sheet with aluminum foil, and grease with non-stick cooking spray.
Arrange saltine crackers in an even layer on the baking sheet, and set aside.
To a medium saucepan over medium-high heat, add the salted butter, light brown sugar, and granulated white sugar. Using a heat-safe silicone spatula, continuously stir the mixture until it comes to a boil. Continue cooking and stirring for another 2-3 minutes, until the mixture has a caramel brown color.
Pour the mixture over the saltine crackers and use the silicone spatula to spread into an even layer.
Place the sheet pan in the oven and bake the cracker toffee for 5 minutes, or until the caramel is bubbly.
Remove the pan from the oven and Immediately sprinkle the mini chocolate chips evenly over the top. Wait 1-2 minutes for the chocolate to melt, then use a silicone spatula to spread the melted chocolate evenly over the toffee.
Sprinkle red and green M&Ms and holiday sprinkles over the top of the chocolate.
Place the pan into the fridge for about 20 minutes, or until the toffee sets.
When ready to serve, lift the aluminum foil to remove the saltine cracker toffee from the sheet pan. Use your fingers or a knife to break or cut the toffee into uneven pieces.
Notes
Store the cracker toffee in an airtight container at room temperature or in the fridge for up to one week. You can also freeze for up to 3 months.Melting the Chocolate Chips The easiest way to melt the chocolate is to sprinkle it over the warm caramel crackers. If you do it when the pan is straight out of the oven, you shouldn’t have any problems.If the caramel has already cooled, you can sprinkle the chocolate chips on top and put the pan back into the oven for another 2-3 minutes or until the chocolate melts.Another option is to melt the chocolate chips in a microwave or a double boiler beforehand, then spread the melted chocolate over the mixture just like you normally would.