a.. 2 cups all purpose flour
b.. 2 cups old-fashioned oats
c.. 1 teaspoon baking soda
d.. 1/2 teaspoon baking powder
e.. 1/2 teaspoon salt
f.. 1 cup (2 sticks) unsalted butter, room temperature
g.. 3/4 cup sugar
h.. 3/4 cup plus 2 tablespoons packed dark brown sugar
i.. 2 large eggs
j.. 1 teaspoon vanilla extract
k.. 1-1/2 cups semisweet chocolate chips
l.. 1 cup chopped toasted walnuts (about 4 ounces)
a.. Whisk first 5 ingredients in medium bowl to blend, then set aside.
b.. Using an electric mixer, beat the butter and both sugars in a large bowl until light and fluffy. Add eggs and vanilla. Mix thoroughly. Add dry ingredients and beat until just blended. Stir in chocolate chips and walnuts. Cover dough and chill 1 hour.
c.. Preheat oven to 350°F. Form dough into balls, using 1/4 cup dough for each. Place on greased baking sheets, spacing 2 inches apart. Flatten with hand to 3 1/2-inch rounds. Bake 10-15 minutes or until cookies are golden brown around edges and firm in center. Transfer to cooling racks to cool completely.
d.. Makes about 20 cookies.