Thinly slice the Chicken Breast into bite size pieces. In a zip lock bag mix 1/4 Cup of flour with 1/2 tsp of Salt. Add the sliced Chicken, seal bag and lightly shake to coat chicken in flour mixture.
Heat 2 tablespoons of olive oil in a large sauté pan on medium heat. Cook the chicken in two batches in the pan crisping up the floured surface. Add additional olive oil as needed. Set aside.
Start water for cooking the pasta. Don't forget to add salt to your water. This is your only chance to properly season your pasta. :)
In a sauté pan melt 2 tbsp of butter with 1 tbsp of olive oil on medium heat. Stir in 3 tbsp of flour and cook for a couple minutes. Then slowly pour in half-n-half and chicken broth. Be sure to continually stir as you are added the broth and half-n-half. Otherwise your sauce may end up lumpy. Continue cooking for about 10 -15 minutes until sauce thickens. Then add the sun-dried tomatoes. Season with salt and pepper to taste.
By now your pasta water should be boiling. Cook the pasta until al dente per the package directions. I have found that to ensure the pasta does not overcook, I will set a timer to cook it exactly as directed on the package. Reserve 1 Cup of Pasta water before draining the pasta.
Add the pasta to the sauce and cook for a 5 more minutes adding small amounts of pasta water as needed to thin out the sauce if it gets too thick. Add cooked chicken and spinach, toss in sauce.
Sprinkle with Parmesan and add additional salt and pepper as needed.