Zest the lemon until you have 1/2 teaspoon. Juice half of the lemon, reserving 1 1/2 teaspoons. Cut the remaining half into wedges and set aside.
1 medium lemon
Season the chicken on all sides with salt and pepper.
1 1/2 pounds boneless skinless chicken thighs, Kosher salt and ground black pepper
Heat the olive oil in a large dutch oven or saucepan set over medium heat. Add the chicken and cook 4-5 minutes per side, until golden brown and cooked through to an internal temperature of 165°F. Transfer to a plate and set aside.
1 tablespoon extra virgin olive oil
Add the chopped onion to the pot and cook 4-5 minutes, stirring and scraping up any browned bits from the bottom. (Note: add a splash of water to the bottom of the pan if it’s getting too dark).
1 medium yellow onion
Stir in the peas and asparagus and cook 2-3 minutes, until bright and beginning to soften. Add the garlic and cook 30-60 seconds, until fragrant.
Sprinkle in the flour and cook, stirring frequently, for 1-2 minutes.
2 tablespoons all-purpose flour
Pour in the chicken stock, then add the dill, basil, dried tarragon, and orzo. Bring to a boil, then reduce the heat to low. Simmer 10-12 minutes, stirring occasionally, until the orzo is tender and the sauce has thickened.
Stir in the heavy cream and parmesan until smooth. Season with the salt and pepper. Add the reserved lemon zest and lemon juice and stir to combine.
1/4 cup heavy cream, 1/4 cup grated or shredded parmesan cheese, 1/2 teaspoon fine sea salt, 1/4 teaspoon ground black pepper
Return the chicken to the pot and simmer 2-3 minutes, until heated through. Garnish with additional dill and basil and serve with lemon wedges on the side.
Notes
If using chicken breast, increase cooking time to 6-8 minutes per side.
If using rotisserie/precooked chicken, add during the final step to heat through.