In a skillet over medium heat, melt 1 tablespoon of unsalted butter. Add ½ cup of chopped pecans and toast them for about 5 minutes, stirring frequently, until they turn golden brown and fragrant.

Preheat your oven to 350°F (175°C). Line an 8x8-inch baking pan with parchment paper.

In a medium-sized saucepan, melt 1 stick (4 oz) of unsalted butter over low heat. Stir in 1 cup of packed light brown sugar, mixing well for about 30 seconds, before whisking in 1 large egg.

In a separate bowl, sift together 1 cup of all-purpose flour, ½ teaspoon of baking powder, and ½ teaspoon of ground cinnamon. Gradually add this to the butter and sugar mixture.

Fold in the toasted pecans, ½ cup of toffee bits, and ¾ cup of white chocolate chips until evenly distributed.

Pour the batter into your prepared baking pan, spreading it evenly into the corners. Bake for 25-30 minutes.

Remove the pan from the oven and allow the blondies to cool in the pan for at least 20 minutes before cutting into squares.