01 - Bring a large pot of salted water to a rolling boil. Add the pasta and cook according to package directions until al dente. Reserve 1/2 cup (120ml) of the pasta cooking water before draining.
02 - While the pasta is cooking, season the chicken breasts evenly with salt and black pepper.
03 - Heat the olive oil in a large skillet over medium-high heat. Carefully place the seasoned chicken breasts in the hot skillet and sear for 4-5 minutes per side, until golden brown and cooked through. Transfer the cooked chicken to a plate and allow it to rest.
04 - In the same skillet, melt the unsalted butter over medium heat. Add the finely chopped shallot and minced garlic and sauté for 2-3 minutes until softened and fragrant.
05 - Stir in the apricot jam, chicken broth, white wine vinegar, and fresh thyme leaves. Bring the mixture to a simmer and cook for 3-4 minutes, stirring frequently, until it has slightly thickened. If using, add the chili flakes at this stage.
06 - Slice the rested chicken breasts into strips. Return the sliced chicken to the skillet with the glaze, tossing gently to ensure each piece is well coated. Allow to simmer for 2 minutes to heat the chicken through.
07 - Add the drained pasta to the skillet with the glazed chicken. Toss everything together to coat the pasta evenly. If the sauce appears too thick, gradually add the reserved pasta water, a tablespoon at a time, until a silky sauce consistency is achieved.
08 - Remove the skillet from the heat. Stir in the chopped fresh parsley and lemon zest, if using. Taste and adjust seasoning with freshly ground black pepper as needed.
09 - Serve the Jam-Glazed Chicken Pasta immediately. Garnish with extra fresh thyme and grated Parmesan cheese, if desired.