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Preheat oven to 350°F. Line a baking sheet with parchment paper.
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Sift first 4 ingredients into medium bowl.
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Cream the butter in large bowl until fluffy. Add sugar and vanilla; beat until blended.
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Add flour mixture and beat until moist clumps form. Mix in oats with spatula until evenly distributed (dough will be very firm). Add chocolate chips and knead gently to blend.
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Using moistened palms, shape 1 generous tablespoon dough into ball. Place on prepared sheet; flatten to 2-inch round. Repeat with remaining dough, spacing rounds about 2 inches apart.
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Bake cookies until center is slightly firm and top is cracked, about 14 minutes. Cool on sheet.