In stand mixer or large bowl, add the butter, shortening, and sugars, beat for 3 mins on medium speed
½ cup unsalted butter, softened (112g), ½ cup vegetable shortening (100g), ¾ cup granulated sugar (160g), ¾ cup brown sugar, packed (185g)
Add eggs and vanilla, beat on low to incorporate, then medium for 2 mins
2 whole large eggs, 1 egg yolk, 2 teaspoon vanilla
Add flour, baking soda, salt. Mix on low until mixed, then on medium for 2-3 mins
2 cups GF 1-1 flour (290g), 1 teaspoon baking soda, 1 teaspoon salt
Remove from stand mixer, if using. Stir in oats, chocolate chips, and marshmallows.
1 cup GF Oats (120g), 1.5 cups chocolate chips (285g), 1.5 cups Dandies Vegan marshmallows (155g)
Chill in fridge for at least 4 hours - longer is ok too!
Preheat oven to 350°. Prepared cookie sheets with parchment paper or silpat mat. Using # 70 cookie scoop (1TBSP), place 2 inches apart. Bake for 9-11 mins. Let cool on pan for about 2 mins, then move to cooling racks.