Step 1: Preheat the Oven

Start by preheating your oven to 250°F (120°C) and line a large baking sheet with parchment paper to prevent sticking.

Step 2: Mix Dry Ingredients

In a large mixing bowl, combine the Rice Chex cereal and mini pretzels. Set this aside while you prepare the toffee coating.

Step 3: Make the Toffee

In a medium saucepan over medium heat, melt the butter. Add the brown sugar and corn syrup. Stir constantly until the mixture reaches a boil. Allow it to boil for 3 minutes without stirring, then remove it from heat.

Step 4: Add Final Ingredients to Toffee

Stir in the vanilla extract and baking soda to the toffee mixture. It will become light and foamy, which is exactly what you want for a good coating.

Step 5: Combine Toffee and Dry Mix

Pour the foamy toffee mixture over the prepared cereal and pretzels. Stir well to ensure everything is evenly coated.

Step 6: Bake

Spread the mixture onto the lined baking sheet in an even layer. Bake in the preheated oven for 45 minutes, stirring every 15 minutes to promote even baking and coating.

Step 7: Cooling and Chocolate Addition

After baking, let the mix cool completely. If using chocolate chips, sprinkle them over the mix while it is still slightly warm but not hot, to prevent them from completely melting.

Variation

Consider adding roasted nuts or dried fruit for additional flavors and textures.