Preparation Whisk first 5 ingredients in large bowl. Add chicken breasts; turn to coat. Cover chicken breasts and chill 3 to 4 hours, turning occasionally. Whisk cream cheese and guava paste in medium bowl to blend. Stir in spinach. Cover and chill to firm slightly, at least 2 hours. Transfer to pastry bag. Remove 1 chicken breast from marinade, scraping excess marinade back into bowl. Insert small sharp knife into 1 side of chicken breast; move knife in arc to create large pocket, keeping opening about 1 1/2 inches long. Repeat with remaining chicken. Pipe filling through openings in chicken breasts to fill pockets. Close openings with metal turkey pins or toothpicks. (Can be made 4 hours ahead. Cover and chill.) Heat 1 tablespoon canola oil in each of 2 heavy large skillets over medium heat. Add 3 chicken breasts to each skillet. Cook chicken until brown, about 3 minutes per side. Transfer to plate. Transfer any juices from 1 skillet into second skillet. Add wine and broth to second skillet. Bring to boil. Add chicken breasts to wine mixture in skillet. Cover skillet; reduce heat to medium and simmer until chicken is cooked through, basting occasionally, about 10 minutes. Transfer chicken to work surface; let stand 10 minutes. Meanwhile, melt butter in another heavy large skillet over medium-high heat. Add mango slices and sauté until brown, about 2 minutes per side. Slice chicken diagonally into 1/2-inch-thick slices. Arrange chicken on platter. Boil juices in skillet until slightly thickened and sauce is reduced to 3/4 cup, about 3 minutes. Drizzle sauce over chicken and surround with mango. *A firm block of concentrated fruit available at some supermarkets, at Latin markets, and at cafecubano.com.
Preparation Whisk first 5 ingredients in large bowl. Add chicken breasts; turn to coat. Cover chicken breasts and chill 3 to 4 hours, turning occasionally. Whisk cream cheese and guava paste in medium bowl to blend. Stir in spinach. Cover and chill to firm slightly, at least 2 hours. Transfer to pastry bag. Remove 1 chicken breast from marinade, scraping excess marinade back into bowl. Insert small sharp knife into 1 side of chicken breast; move knife in arc to create large pocket, keeping opening about 1 1/2 inches long. Repeat with remaining chicken. Pipe filling through openings in chicken breasts to fill pockets. Close openings with metal turkey pins or toothpicks. (Can be made 4 hours ahead. Cover and chill.) Heat 1 tablespoon canola oil in each of 2 heavy large skillets over medium heat. Add 3 chicken breasts to each skillet. Cook chicken until brown, about 3 minutes per side. Transfer to plate. Transfer any juices from 1 skillet into second skillet. Add wine and broth to second skillet. Bring to boil. Add chicken breasts to wine mixture in skillet. Cover skillet; reduce heat to medium and simmer until chicken is cooked through, basting occasionally, about 10 minutes. Transfer chicken to work surface; let stand 10 minutes. Meanwhile, melt butter in another heavy large skillet over medium-high heat. Add mango slices and sauté until brown, about 2 minutes per side. Slice chicken diagonally into 1/2-inch-thick slices. Arrange chicken on platter. Boil juices in skillet until slightly thickened and sauce is reduced to 3/4 cup, about 3 minutes. Drizzle sauce over chicken and surround with mango. *A firm block of concentrated fruit available at some supermarkets, at Latin markets, and at cafecubano.com.