Preheat oven to 350 degrees F. Line a baking sheet with parchment paper.
Spread the oats and nuts in an even layer on the baking sheet, then bake for 4 minutes. Stir and bake for another 4 minutes until toasted. Remove from oven.
In a medium saucepan, combine the honey, butter, brown sugar, and salt over medium heat, stirring constantly, just until smooth. Do not let it come to a simmer or boil. Immediately remove from the heat and stir in the vanilla extract.
In a large bowl, combine the toasted oats and nuts with the honey mixture. Stir in any other mix-ins that won't melt like coconut or dried fruit. Let cool for 15 minutes before adding any chocolate chips or mini M&M's.
Line a square pan with parchment paper or foil, then press the granola mixture firmly into the pan by placing a piece of parchment paper on top and pressing down or using a rubber spatula.
Sprinkle extra miniature chocolate chips or other mix-ins on top, if desired, and press them in.
Cover and refrigerate for at least 1-2 hours, then let the bars sit on the counter for 10 minutes before cutting into 12 rectangles using a sharp knife.
Store in an airtight container in the fridge or on the counter for up to 1 week or freeze for up to 2 months.