Step 1: Preheat the Oven - Start by preheating your oven to 350°F (175°C).
Step 2: Prepare the Baking Pan - Grease your 9x13-inch baking pan with butter or non-stick spray.
Step 3: Mix the Base - In a large mixing bowl, combine the butter, lemon cake mix, and egg. Whisk until smooth.
Step 4: Spread the Batter - Spread the thick batter evenly into the prepared baking pan.
Step 5: Add Coconut and Chocolate - Sprinkle the coconut and white chocolate chips over the batter.
Step 6: Pour the Condensed Milk - Drizzle approximately 8 ounces of sweetened condensed milk over the top.
Step 7: Bake - Bake for 25-30 minutes until the edges are golden brown.
Step 8: Cool and Cut - Allow to cool completely before slicing into squares or bars.
