Rebusan Krim Jepang (Rebusan Putih)

Bahan-bahan (6 porsi)

• 1 lb boneless, skinless chicken thighs ((2–4 pieces; the size can vary, so go by weight) )
• ½ tsp Diamond Crystal kosher salt ((for the chicken))
• freshly ground black pepper
• 1 head broccoli ((4 oz, 120 g))
• 1 tsp Diamond Crystal kosher salt ((for the broccoli))
• 1 onion ((11 oz, 312 g))
• 2 carrots ((9 oz, 255 g))
• 2 Yukon gold potatoes
• 6 cremini mushrooms ((3 oz, 85 g))
• 1 Tbsp unsalted butter
• 1 Tbsp extra virgin olive oil
• 2 cups chicken or vegetable stock
• 2 bay leaves
• 3 Tbsp unsalted butter
• 1 cup whole milk
• 3 Tbsp all-purpose flour (plain flour)
• 1 tsp Diamond Crystal kosher salt
• ⅛ tsp white pepper powder
• ⅛ tsp ground nutmeg
• 1 box Japanese Cream Stew Mix ((optional; skip if you make the homemade white sauce above))
• 2 Tbsp heavy (whipping) cream ((optional))
• 1 tsp Diamond Crystal kosher salt ((to taste))