Preheat oven to 350F degrees and spray a 9"x13" baking dish with non stick cooking spray (Bakers Joy), set aside. Or, line baking dish with parchment paper for easiest removal.
In a medium bowl whisk together flour, baking powder and salt, set aside.
In another bowl beat together melted butter, and both sugars.
Beat this mixture until fully combined.
Add in eggs, vanilla extract and rum extract.
Beat this mixture until incorporated.
Add the dry ingredients to the wet ingredients, fold this mixture together until just combined.
Fold in the toffee bits until blended.
Spread batter into prepared pan and top with extra toffee bits and salt if desired and bake for 25-30 minutes until set and golden.
Notes: Cool completely before slicing and serving.
If you don't like rum extract, just leave them out.
You can find the toffee baking bits where the chocolate chips are in your grocery store.
The flaked sea salt topping is optional in this but I really love the contrast of flavor it adds against the sweet blondies.
After making these, I realized that lining the baking dish with parchment paper would've made for easier removal and slicing. So if you have parchment paper, I definitely recommend using it instead of just baking spray.