1. |
Heat the olive oil in a large sauté pan over medium heat. Season chicken with salt and pepper and add them to the pan in a single layer. |
2. |
Sauté the chicken on both sides until golden brown, about 2 minutes per side. Transfer the chicken to a platter and keep warm. |
3. |
Meanwhile, place the asparagus in a microwave safe bowl with a splash of water and cover loosely with plastic wrap. Microwave the asparagus on high until it is just tender, about 2 to 3 minutes. Drain and set aside. |
4. |
Lower the heat and add the onions. Cook until the onions are soft and translucent, about 5 minutes. Add garlic and cook for 1 minute more. |
5. |
Add wine to the pan, turn heat to medium and reduce the wine until it is almost completely evaporated. |
6. |
Add chicken broth and reduce it by half. Whisk in the mustard, sour cream, and tarragon and stir until the sauce is smooth and creamy. |
7. |
Add the chicken and asparagus to the sauce to heat them for a minute or two. |
8. |
Transfer the chicken and asparagus to a platter. Sprinkle with a little tarragon if using fresh. |