1. Heat a large skillet over medium heat. Add oil to pan; swirl to coat. Add garlic; cook 2 minutes, stirring frequently. Remove garlic from pan using a slotted spoon; reserve garlic. Increase heat to medium-high. Add pancetta; sauté 4 minutes or until crisp. Remove pancetta from pan using a slotted spoon; reserve pancetta.
2. Sprinkle chicken with salt and pepper; sauté 4 minutes on each side. Remove chicken from pan. Add wine; bring to a boil, scraping pan to loosen browned bits. Cook until the liquid almost evaporates (about 3 minutes). Return chicken to pan. Add stock; bring to a boil. Reduce heat to medium, cover, and cook for 6 minutes or until chicken is done. Remove chicken from pan.
3. Add mascarpone to pan, stirring with a whisk until smooth. Combine water and flour, stirring with a whisk. Add flour mixture to pan; bring to a boil. Cook 2 minutes; stir in pancetta, garlic, and peas. Cook 1 minute. Serve sauce over chicken.