Butter an 8x8 baking pan and set aside. In large bowl, combine oats and cereal only.
In a saucepan, melt brown sugar, honey, and butter over medium heat, stirring, until it reaches a low boil. Immediately reduce to simmer, and stir another 2 minutes. Remove from heat, and stir in cinnamon and vanilla extract until fully incorporated.
Carefully pour melted honey mixture over the cereal mixture. Mix until fully incorporated. Press granola mixture into the buttered pan, pressing down to pack the granola tightly and evenly into pan. Sprinkle mini chocolate chips evenly over top of granola, using back of spoon or slightly wet hands. (Mini chips may melt if you try to fully mix into the granola rather than sprinkle on top)
Allow granola to fully cool before cutting. Store in airtight container.
Note: If your granola bars break apart, it may help to chill the bars prior to cutting.