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Step 1
Start by heating your oven to 350°F (175°C) and grease an 8x12-inch baking pan. In a bowl, cream together the butter, half a cup of brown sugar, and one cup of flour until everything is nicely combined. Press this mixture evenly into the bottom of your prepared pan. Pop it in the oven and bake for about 20 minutes, just until it feels firm but hasn’t started to brown. Once it’s done, take it out and lower the oven temperature to 325°F (165°C).
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Step 2
Next, beat together the remaining cup of brown sugar, eggs, two tablespoons of flour, vanilla, baking powder, and salt until the mixture is light and fluffy — this should take around two minutes. Stir in the walnuts gently, just enough to combine without turning it into a paste. Spread this filling over the crust, then sprinkle the shredded coconut evenly on top.
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Step 3
Bake everything again for about 25 minutes, until the filling is set. Let the bars cool slightly, then cut them into squares while they’re still warm. Enjoy!