Skillet Creamy Lemon Chicken Pasta with Broccoli

"The brand of penne you use will define how much liquid to add total. When I use the Creamette (green package) brand of penne that cooks to al dente in 7 or so minutes, I use the amounts stated in the recipe. But I've also made this with Barilla penne which is slightly thicker and needs 10-11 minutes to cook until al dente. When using a pasta like that (thicker with more cooking time needed), keep your eye on the liquid amount. If the liquid is mostly absorbed but the pasta isn't close to being tender yet, add another 1/2 cup liquid to the skillet (and possibly another minute or so of cooking time). If you want to give a burst of fresh lemon flavor, squeeze an additional 1 tablespoon of fresh lemon juice into the skillet pasta right before serving. Also, if you don't have a large 12-inch skillet, you could totally make this in a large pot. Finally, if you like your sauce a bit thicker, use a little extra cornstarch (maybe another 1/2 tablespoon?) or cover the skillet off the heat and let the pasta sit for 5-10 minutes before serving...."