- Preheat oven to 350 degrees. 
- Line a 9 x 13 baking pan with parchment paper. 
- In a stand mixer, or use a hand mixer and medium bowl, mix the softened  butter and brown sugar. 
- Add the gluten free flour and mix until crumbly. 
- Put crust into pan and use hand to lightly pat crust mixture onto the bottom of the baking pan. 
- Bake for 15-17 minutes. 
- Remove from oven. 
- In a small saucepan add the butter, maple syrup, corn syrup, brown sugar and vanilla and heat on medium-high heat. 
- Stir and let mixture heat to boiling. 
- Once boiling let cook for 2 minutes, stirring frequently. 
- Sprinkle the nuts and the pretzels over the crust. 
- Pour the hot liquid over the top of the bars. 
- Place baking pan back in the oven and bake for another 15 minutes. 
- Remove and let cool completely before cutting. 
- Enjoy!