Preheat the Oven: Start by preheating your oven to 350°F (175°C). This step is crucial for a perfect bake!
Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking powder, and salt. Set aside.
Whisk Wet Ingredients: In another bowl, combine the melted butter, eggs, lemon juice, and lemon zest. Whisk them together until they’re well blended.
Combine Mixtures: Gradually pour the wet mixture into the dry ingredients, stirring gently until just combined. Be careful not to overmix—lumpy batter is okay!
Pour and Bake: Pour the batter into a greased baking pan and smooth the top. Bake in your preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Cool and Serve: Allow the Sunshine Slice to cool in the pan for about 10 minutes before transferring it to a wire rack. Once cooled, slice into pieces and enjoy!