1-Preheat your oven to 350°F (175°C) and prepare a baking dish by greasing it lightly or lining it with parchment paper.

2-In a large mixing bowl, combine the all-purpose flour, cornstarch, baking soda, and salt, mixing until well blended.

3-Add the melted and cooled unsalted butter, packed brown sugar, and granulated sugar to the bowl, stirring until the mixture is crumbly.

4-Beat in the large eggs and pure vanilla extract until the batter is smooth and even.

5-Fold in the mini or regular-size candy-coated chocolates and semi-sweet chocolate chips, ensuring they are distributed throughout the batter.

6-For adaptations like vegan or gluten-free, substitute ingredients at this point, such as flaxseed meal for eggs.

7-Pour the batter into the prepared baking dish and spread it evenly.

8-Bake in the preheated oven for 25-30 minutes, or until the edges are golden brown and a toothpick inserted in the center comes out clean.

9-Remove from the oven and let the bars cool completely before cutting them into pieces for serving.