Chewy Christmas Snickerdoodles

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1. 1
   Add 1 stick of butter to a skillet set over medium heat. Cook until the butter begins to brown, about 3-4 minutes. Remove from the heat and transfer to a heatproof bowl. Freeze for 10-15 minutes, but no longer.
2. 2
   Preheat the oven to 350° F. Line a baking sheet with parchment paper.
3. 3
   In a bowl, beat together the remaining stick of butter, the cooled browned butter, and the brown sugar until combined. Beat in the eggs and 1 egg yolk, one at a time, until combined. Add the vanilla, beating until creamy. Add the flour, baking soda, and salt.
4. 4
   Fold in 3/4 cup of the M&M's, pretzels, chocolate chips, and chocolate chunks.
5. 5
   Mix the sugar and cinnamon in a bowl. Roll the dough into rounded 2-3 tablespoon-size balls and then roll through the cinnamon sugar. Place 3 inches apart on the prepared baking sheet.
6. 6
   Bake for 8 minutes, then rotate the pan and push the remaining M&M's into the cookies. Bake for 2-3 minutes more. Remove from the oven and let the cookies cool on the baking sheet. They will continue to cook slightly as they sit on the baking sheet.
7. 7
   Eat warm or let cool and store in an airtight container for up to 4 days.