Cook the penne pasta according to package instructions until al dente.
Before draining, reserve ½ cup of the pasta cooking water. Drain the pasta and set aside.
Heat 2 tablespoons olive oil in a large skillet over medium heat.
Add the chicken strips and cook for 5–8 minutes, stirring occasionally, until fully cooked and no longer pink.
Season the chicken with salt and pepper and stir well.
Add the red, yellow, and orange bell peppers along with the diced shallots.
Cook for 4–7 minutes until the vegetables begin to soften and lightly brown around the edges.
Stir in the minced garlic and cook for 1 additional minute.
Add the balsamic vinegar, lemon juice, remaining tablespoon of olive oil, reserved pasta water, and cooked pasta.
Toss everything together and cook for 3–4 minutes until the flavors combine and the sauce lightly coats the pasta.
Transfer the 30 Minute Chicken Vegetable Skillet Pasta to a serving bowl or platter.
Garnish with parsley and serve warm.