Line a 15x10x1-inch baking sheet with parchment paper. Lay crackers in a single layer to cover the bottom of the pan. Set aside. Preheat oven to 375°F.
In a small saucepan over medium-high heat, melt butter. Add in sugar and bring to a rolling boil, stirring constantly. Once boiling, remove from heat and add ¼ cup peanut butter and stir until smooth. Pour over crackers.
Bake for 10 minutes. Remove from oven and cool completely.
In a small, microwave safe bowl, combine white chocolate chips with remaining 1/4 cup peanut butter. Microwave for one minute, stir until smooth. If not completely melted, heat for 15 second intervals, stirring each time to test for smoothness. Pour over slightly cooled (they can still be a little warm) toffee.
Cool completely (I put it in the refrigerator to speed set the toffee).
Once cooled, cut into bite sized pieces and enjoy. Store in airtight container.
Notes
Club crackers or graham crackers can be substituted for the saltines.
Line your baking sheet with parchment paper. This will not only make the crackers easier to remove from the pan, but it will make clean up so much easier!
Allow crackers to cool completely before breaking into pieces. You can either let them cool in the pan, or using the parchment paper, slide the entire pan of toffee onto a wire rack to cool.
Once cooled, use a sharp knife to cut these into pieces. Store in airtight container until ready to eat.