Preheat oven to 350 degrees F. Spray a 9x13 baking dish with cooking spray.
Make the pretzel crust. Use a food processor to crush enough pretzels to make 2 cups. Set aside ½ cup and combine 1 ½ cups crushed pretzels (168 grams) with brown sugar, cinnamon, melted butter, and egg white until well mixed. Press the pretzel crust into the prepared baking pan in one even layer. Bake for 10 minutes. Remove from the oven and let cool completely.
Meanwhile, peel and slice the granny smith apples about ¼ inch thick. Toss the apples with cornstarch, cinnamon, nutmeg, ground cloves, brown sugar, lemon juice, and vanilla. Lay the apples into the pretzel crust, spreading out the apples to fill in the gaps.
Make the streusel. Combine all-purpose flour with brown sugar, the reserved ½ cup crushed pretzels, chopped roasted peanuts, cinnamon, and cold butter. Incorporate the butter using a pastry cutter until the mixture resembled coarse sand.
Sprinkle the peanut pretzel streusel on top of the apples in one even layer. Bake the apple pie bars for 45 minutes- 1 hour or until a knife can easily pierce through the apples and the streusel is golden brown. Remove from the oven and let cool slightly.
Cut the apple pretzel pie into 12 bars and serve warm with vanilla ice cream if desired.