Preheat oven to 375 D. Fine a 9x13-inch glass baking dish with parchment paper and spray lightly with non-stick cooking spray.
In a mixing bowl, combine the melted butter, brown sugar, eggs and vanilla. Then add the flour, baking powder and salt and form into blondie brownie batter.
Mix in the white chocolate chips, toffee bits and chopped pecans. Pour the batter into the prepared baking dish.
Bake in the preheated oven for 30 to 35 minutes, or until toothpick comes out clean in the center.
Serve Blondie Toffee Brownies with scoop of ice cream on top.