Dice your strawberries into small bite-sized pieces and use a paper towel to pat dry the strawberry pieces to absorb the excess moisture. Do not skip this step! Set aside.
Preheat the oven to 400 degrees. Line a large sheet pan with foil. Place one even layer of saltines in the pan until covered and set it aside.
Melt the butter and brown sugar together in a saucepan over medium heat. Bring mixture to a rolling boil for 3 minutes while continuously stirring and as the mixture thickens.
Pour the toffee mixture over the crackers quickly and evenly, spreading it out over the entire face of the crackers and bake in the oven for 7 minutes.
Remove the pan from the oven and quickly sprinkle the semi-sweet chocolate chips over the hot toffee.
As they melt, using an offset spatula, spread the chocolate like icing, until the whole surface is covered.
Next sprinkle the white chocolate chips out over the melted semi sweet chocolate layer and once they melt (you may have to pop the pan back into the oven for 1 more minute to get them to slightly melt) use a toothpick to swirl the white chocolate into the semi sweet chocolate layer.
Pat your strawberry pieces dry one more time with a clean paper towel. Then sprinkle an even layer of the chopped strawberries over the warm chocolate until covered.
Place the entire pan in the refrigerator for an hour to cool and set, then break the toffee into pieces and enjoy!
Note: This toffee bark needs to stay in the fridge until you're ready to serve it. Strawberries naturally have excess juices and patting the pieces dry and keeping the bark in the fridge helps keep the strawberries cold and from juicing.