Add white chocolate chips to a large microwave-safe mixing bowl. Heat chocolate in 15-30 second intervals, stirring in between with a spatula until chocolate is completely melted and smooth. You can also melt the chocolate on the stove using the double boiler method.
Using a whisk, add in lemon juice and cashew butter and whisk until the mixture becomes uniform in color and smooth. Stir in the zest until it is evenly mixed in.
Pour batter into the prepared baking pan. Place into fridge for 30-60 minutes or until set. When brownies are set, the batter should feel solid. Slice brownies with a sharp knife. The brownies are very fudgy and should just hold their shape when cut straight out of the fridge. If left to sit out, they will be less firm and hard to hold so it is best to serve them chilled. Store any uneaten brownies in the fridge.
Notes
These brownies do not have the texture of regular baked brownies. They are very fudgy, soft, and a little bit chewy. They are also very rich and sweet. If you prefer more texture you can add quick oats (3 tbsp added with the zest) to the batter which will help break up the sweetness and add more chewiness to the brownies.
Make sure to use natural unsweetened cashew butter or peanut butter. You can also use natural sunflower seed butter if you need a nut-free substitute. Natural means there are no added oils in the spread. The only ingredient listed should be cashews.
You will need 1-2 large lemons for this recipe, depending on how juicy your lemons are. You will likely not need all the zest or juice produced from the lemons.
The brownies don't really need any frosting but if you would like to decorate the brownies, I used an easy lemon icing on top. Wait for the brownies to set before adding the frosting.
Optional Lemon Frosting: In a medium bowl, combine 1 cup powdered sugar and 1 tbsp fresh lemon juice. Stir until you have a thick icing. If your icing is too thick you can add a little more lemon juice. If it becomes too thin you can add more powdered sugar. When the brownies are set, spread icing over surface of the brownies. Sprinkle about 1 tsp zest over surface. Then place brownies back into fridge until ready to cut and serve.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.