Make the chicken by trimming excess fat, tossing in the olive oil and Italian seasoning mix in a large bowl. Bake on a lined baking sheet at 375 for 45-50 minutes. Slice and set aside. This can be done well in advance or use leftovers.
Place a large pot of water over high heat. While that heats up, start the sauce.
In a separate large skillet melt butter just under medium heat.
Add shallots and cook 7 minutes.
Add minced garlic and cook 2 minutes more.
Add white wine and allow to simmer for 3 minutes.
Add the chicken stock, stir and allow to thicken and reduce for 10 minutes.
Your water should be boiling by now, salt the water and add the orzo. Cook per package instructions for al dente. If using the brand Delallo, it needs 11 minutes. Stir occassionally. Strain once done.
To the skillet pour in the heavy whipping cream, salt, pepper and red pepper flakes. Stir together then add the parmesan cheese. Whisk until the cheese is melted into the sauce and allow to thicken for a couple minutes.
Once thick and bubbly add the packed sundried tomatoes, fresh spinach, cooked orzo and sliced chicken thighs. Stir and serve.