Preheat oven to 375°F. Line a 9x13-inch baking pan and spray the sides with nonstick spray. Set aside.
To make the crust, whisk the flour, sugar, baking powder, and salt together in a large bowl, then add the butter and cut it in using a pastry cutter or a fork until a fine crumb forms.
1¾ cup all-purpose flour, ¾ cup granulated sugar, ½ teaspoon baking powder, ⅛ teaspoon kosher salt, ¾ cup unsalted butter
Press the dough into the prepared baking pan and bake for 10-12 minutes, or until it turns a light, golden color around the edges.
Let the crust cool for 10 minutes.
While the crust cools, melt the caramel bits in the microwave for 1½ minutes, stirring every 30 seconds. Add the butter and stir to combine.
2 cups Kraft Caramel Bits, 3 tablespoons unsalted butter
Pour the caramel onto the baked crust and quickly and gently spread it out before it starts to harden.
Sprinkle 1½ cup of the pecans on top along with ¾ cup of the pretzels and all the chocolate chips.
2 cups pecan halves, 1 cup crumbled mini pretzel twists, 2 cups semisweet chocolate chips
Return it to the oven for 5 more minutes then sprinkle on the remaining pecans and pretzels and let it rest for 30 minutes before slicing and serving.