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Heat convection oven to 300°F (standard oven: 350°F). Lightly spray sheet pans with vegetable cooking spray. Place parchment paper on prepared sheet pans.
Blend together brownie mix (dry) and flour in 20 qt. bowl of mixer fitted with paddle attachment. Mix on low speed 30 seconds. Gradually add oil, water and eggs; continue mixing on low speed 1 minute or until fully incorporated. Stir in REESE'S Peanut Butter Chips. Using #16 scoop (3 oz.), drop dough on prepared sheet pans, 6 cookies per pan.
Bake 12 to 15 minutes* or until cookie is set. Cool 2 to 3 minutes. Remove cookies from sheet pans to wire rack. Cool completely.
*If using convection oven, rotate pans one-half turn (180°) after 6 minutes of baking.