Cook pasta to slightly firm. Sautée chicken in large nonstick skillet on medium-high heat 5 to 7 min. or until done, stirring occasionally. Remove from skillet. Mix flour and broth in same skillet with whisk. Stir in Mascarpone, 2 Tbsp. Parm, garlic powder and pepper; cook 2 min. or until mixture boils and thickens, stirring constantly. Stir in chicken. Drain pasta; place in large bowl. Add chicken mixture; toss to coat. Sprinkle with remaining Parm.
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