Caramel Chocolate Crunch Bars

nbsp;   2 cups

    finely crushed pretzels (about 12 oz)
    1/2 cup melted unsalted butter
    1/4 cup granulated sugar
    1 cup packed light brown sugar
    1/2 cup unsalted butter (for caramel)
    1/4 cup heavy cream (room temperature)
    1 1/2 cups semi-sweet chocolate chips
    1/2 teaspoon vanilla extract
    Pinch of flaky sea salt
    1/2 cup white chocolate chips (optional)

Directions:

Step 1: Prepare the