1½ cups all-purpose flour
1 teaspoon baking soda
1 teaspoon ground cinnamon
½ cup firmly packed light brown sugar
1 cup sugar
1 cup (2 sticks) butter
1 large egg
1 teaspoon vanilla extract
1½ cups old-fashioned oats
1 cup semisweet chocolate chips
Mix together flour, baking soda and cinnamon. Set aside. Using an electric mixer, cream together the sugars and butter until light and fluffy. Add egg and vanilla and mix well. On low speed, beat in the flour mixture just until blended. Stop mixer and fold in the oats and chips with a wooden spoon. Cover the cookie dough with plastic wrap and chill 1 hour.
Heat oven to 350 degrees. Grease or line 2 baking sheets with parchment paper. Roll the dough into 1-inch balls and place about 2 inches apart on prepared pans. Bake 10-12 minutes, or until light brown around edges. Cool on pan 5 minutes, then transfer to wire racks to cool completely.
Store in metal tins or on foil-wrapped platter.
Makes about 4 dozen.
Nutrition values per cookie: 84 calories, 4 g fat (3 g saturated), 10 g carbohydrates, 1 g fiber, 1 g protein, 14 mg cholesterol, 61 mg sodium.