Chicken Thighs: In Creamy Mustard Sauce

Ingredients

• 1.4 lb chicken thigh fillets , skinless boneless (4 - 6 pieces)
• 1 1/2 tbsp olive oil
• 1/2 tsp cooking/kosher salt
• 1/4 tsp black pepper
• 1/2 cup thickened/heavy cream
• 1 tbsp Dijon mustard
• 1 tbsp whole grain mustard
• 1/4 tsp cooking/kosher salt
• 1-2 tbsp water , as needed
• 2 tsp fresh tarragon , finely chopped (Note 2)
• 2 tsp parsley , finely chopped