In a medium bowl, whisk together flour, crushed crackers, salt and baking soda. Set aside.
Beat the butter and shortening, with a stand mixer, until smooth.
Cream the brown sugar and granulated sugar.
Beat in the eggs and vanilla.
Add the flour mixture and stir until combined.
Stir in the rolled oats.
Remove one cup of the oat mixture and set aside.
Press the remaining oat mixture into a foil-lined jelly roll pan.
Put the sweetened condensed milk and caramels in a medium, microwave-safe bowl. Microwave for 3-4 minutes, stirring after each minute until the caramels are melted and the mixture is smooth.
Pour the caramel over the bottom layer in the jelly roll pan.
Sprinkle with chocolate chips, butterscotch chips, and cashews.
Crumble the remaining cup of the oat mixture over the top of the bars.
Bake at 350˚F for 22-25 minutes.
Notes
One: Make Ahead
Once the bars have cooled, you can wrap the pan tightly with plastic wrap or cut the bars and store them in an airtight container.
Two: Storage
Store the bars in an airtight container at room temperature for up to three days, in the fridge for up to two weeks, or in the freezer for up to three months.
Three: Nuts
You can use an equal amount of another kind of salted nut as a substitute for the cashews.Adapted from Salted Chewy Cashew-Caramel Bars