Creating Triple Chocolate Brownies is as simple as following these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking pan or line it with parchment paper for easy removal.

2. Melt the Butter: In a medium saucepan, melt the unsalted butter over low heat. Remove from heat and allow to cool slightly.

3. Mix Sugars: Stir in the granulated sugar and brown sugar until combined, creating a smooth mixture.

4. Add Eggs and Vanilla: Add the eggs one at a time, stirring well after each addition. Mix in the vanilla extract until fully incorporated.

5. Combine Dry Ingredients: In a separate bowl, sift together the flour, cocoa powder, and salt.

6. Combine Mixtures: Gradually add the dry ingredients to the sugar mixture, stirring gently until just combined. Be careful not to over-mix.

7. Add the Chocolates: Fold in the semi-sweet chocolate chips, dark chocolate chips, and white chocolate chips (if using).

8. Transfer to Pan: Pour the batter into the prepared baking pan, spreading it evenly.

9. Bake: Place in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

10. Cool: Remove from the oven and allow the brownies to cool in the pan for 15-20 minutes. Then, transfer to a wire rack to cool completely for easier cutting.

11. Slice and Serve: Once cooled, slice the brownies into squares and enjoy.