Pre-heat oven to 400°F.

Line a rimmed 18"x13" baking sheet with parchment paper and even rows of saltine crackers. You should be able to fit 48-50 saltine crackers without overlapping them.

In a medium pot, melt butter and brown sugar over low heat. Once the butter is melted, turn the heat up to medium-high and stir constantly until it turns into a thick, bubbly syrup. Remove from heat and pour over saltine crackers. Use a spatula to spread the mixture and to evenly coat the crackers.

Place baking sheet in oven and bake for 10-12 mins or until toffee has hardened. Meanwhile, melt white chocolate chips or vanilla melting chocolate according to package directions.

Remove baking sheet from oven and pour melted white chocolate over the top. Use a spatula to spread it evenly over the toffee. Then top with sprinkles, M&Ms, nuts or any other toppings you would like.

Place baking sheet in refrigerator or freezer for 20-30 mins to allow the toffee and chocolate to harden. Once it is completely hard throughout, remove and break into small pieces to enjoy.