Ingredients

  • 2 cups all purpose flour
  • 2 cups old-fashioned oats
  • 1 teaspoon baking soda
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1 cup (2 sticks) unsalted butter, room temperature
  • 3/4 cup sugar
  • 3/4 cup plus 2 tablespoons (packed) dark brown sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 1 1/2 cups semisweet chocolate chips
  • 1 cup chopped toasted walnuts (about 4 ounces)

Method

  • Whisk first 5 ingredients in medium bowl to blend.
  • Using electric mixer, beat butter and both sugars in large bowl until light and fluffy.
  • Add eggs and vanilla, beating to combine.
  • Add dry ingredients and beat until just blended.
  • Stir in chocolate chips and walnuts.
  • Cover dough and chill 1 hour.
  • (Can be made 1 day ahead.
  • Keep chilled.
  • Let soften slightly before continuing.)
  • Arrange 2 racks in center of oven; preheat to 350F.
  • Butter 2 baking sheets.
  • Form dough into balls, using 1/4 cup dough for each.
  • Place on prepared sheets, spacing 2 inches apart.
  • Flatten with hand to 3 1/2-inch rounds.
  • Bake 10 minutes, then rotate sheets.
  • Bake until cookies are golden brown around edges and firm in center, about 4 minutes longer.
  • Cool on sheet 5 minutes.
  • Transfer to racks to cool completely.
  • (Can be made 1 week ahead.
  • Store airtight at room temperature.)