Ayam dalam Saus Mustard Krim

Bahan-bahan (4 porsi)

• 700 g / 1.4 lb chicken thigh fillets (, skinless boneless (4 - 6 pieces, Note 1))
• 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
• 1/4 tsp black pepper
• 1 -2 tbsp water (, as needed)
• 2 tsp fresh tarragon (, finely chopped (Note 2))
• 2 tsp parsley (, finely chopped)