Step 1

Melt 1 1/2 sticks unsalted butter and place in a large bowl. Add 1 1/4 cups packed dark brown sugar and stir until combined. Add 2 large eggs and stir until completely incorporated.

Step 2

Coarsely chop 3 cups mini pretzels. Reserve 2 cups for rolling the dough balls. Place the remaining 1 cup in a medium bowl. Add 2 cups white whole-wheat or whole wheat flour, 1 teaspoon baking soda, 1 teaspoon kosher salt, 1 cup milk chocolate chunks or chips, and 1 cup mini marshmallows, and stir to combine. Add to the butter mixture and stir with a wooden spoon until fully combined. Cover and refrigerate overnight.

Step 3

Arrange a rack in the middle of the oven and heat the oven to 350ºF. Line 2 baking sheets with parchment paper. Place the reserved 2 cups chopped mini pretzels in a shallow bowl.

Step 4

Scoop 2 to 3-tablespoon portions of the dough out (if the dough is too stiff, let sit for 10 minutes and try again). Roll each portion into a ball, then roll in the chopped pretzels to coat. Place 6 on each baking sheet, spacing them evenly apart.

Step 5

Bake one sheet at a time until the cookies are golden brown on the edges and set and pale golden brown in the center, 14 to 16 minutes. Let cool at least 20 minutes on the baking sheet. Repeat baking any remaining dough (you can reuse the parchment).