Begin by greasing a 9x13-inch baking dish or lining it with parchment paper for easy removal later.
In a large mixing bowl, combine the Karo syrup (or brown rice syrup), creamy peanut butter, and 1/2 cup sugar. Stir until the mixture is smooth and well combined.
Next, add the corn flakes, roasted salted cashews, and raw unsalted pecans to the bowl. Gently fold the mixture until all the dry ingredients are fully coated with the syrup and peanut butter mixture.
Pour the mixture into the prepared baking dish. Using a spatula, press the mixture firmly into an even layer.
In a small bowl, mix together the 2 tablespoons sugar, 2 tablespoons sucanat or brown sugar, and 1/2 tablespoon softened butter until crumbly. Sprinkle this mixture evenly over the pressed layer in the baking dish.
Sprinkle the 1/2 cup mini chocolate chips over the top of the bars, pressing them gently into the mixture.
In a microwave-safe bowl, melt the 2 1/2 cups chocolate chips in 30-second intervals, stirring in between, until smooth.
Drizzle the melted chocolate evenly over the top of the bars. Allow the bars to cool at room temperature for about 1-2 hours or until set.
Once set, use a sharp knife to cut the bars into squares or rectangles. Serve immediately or store for later.