Preheat oven to 275°F (135°C) and line a large baking sheet with parchment paper. Set aside.
Add the corn puff cereal to a large mixing bowl. Set aside.
In a medium saucepan, combine brown sugar, butter, light corn syrup, and salt. Bring to a boil over medium heat.
Reduce heat and simmer the mixture for 4–5 minutes. Remove from heat and stir in vanilla extract, maple syrup, and baking soda. Mixture will foam slightly and lighten in color.
Pour hot mixture over cereal and stir gently with a greased spatula until cereal is fully coated.
Transfer coated cereal to the prepared baking sheet and spread evenly. Bake for 45 minutes, stirring every 15 minutes.
Let the nuggets cool completely, then break into pieces. Store in an airtight container.
Notes
These treats make great gifts and are a fun twist on caramel corn. Try adding a sprinkle of cinnamon for extra flavor.