Cook the pasta according to the package instructions until al dente. Drain and set aside.
Cook the Chicken:
While the pasta is cooking, heat the olive oil in a large skillet over medium heat. Add the chicken pieces, oregano, and garlic powder. Cook the chicken until browned and fully cooked, about 6-8 minutes.
Make the Sauce:
Add the chicken broth, Dijon mustard, and lemon juice to the skillet with the chicken. Stir well to combine. Let the mixture simmer for a few minutes until slightly reduced.
Add Tomatoes and Spinach:
Stir in the halved tomatoes and fresh spinach. Cook until the spinach is wilted and the tomatoes are softened, about 2-3 minutes.
Combine with Pasta and Feta:
Add the cooked pasta to the skillet and toss everything together. Gently stir in the feta cubes so they begin to melt slightly into the pasta.
Season and Serve:
Season with red pepper flakes and freshly grated Parmesan cheese if desired. Serve immediately and enjoy! Feel free to adjust the seasoning and ingredients based on your preferences!
