10tablespoons(140g)unsalted butterroom temperature
¾cup(150g)brown sugarlight or dark, packed
1largeeggroom temperature
1½teaspoonsvanilla extract
1cup(125g)all-purpose flourweighed in grams or spooned and leveled
½teaspoonbaking powder
½teaspoonsalt
¼teaspoonground cinnamon
¾cup(60.75g)old-fashioned oats
⅔cup(120g)semi-sweet chocolate chips
Instructions
Preheat oven to 350°F and line an 8-inch metal pan with parchment paper.
In a large bowl, cream together the butter and brown sugar until light and fluffy. Mix in the egg and vanilla extract.
Stir the flour, baking powder, salt, and cinnamon into the wet ingredients just until combined. Fold in the oats and chocolate chips.
Press the dough evenly into the prepared pan. Bake on the middle rack until the edges are tan and center is mostly set (about 20-25 minutes).
Notes
Storage: Store cooled cookie bars in an airtight container at room temperature for up to 5 days or in the freezer for 2 months.Nutrition: The provided nutrition information is an estimate for 1 bar, assuming they're cut into 16 equal slices. Accuracy is not guaranteed.