Homemade Green Bean Casserole with Scratch Sauce - Kitchen20

Ingredients

• 1 kg (2.5 lbs) Fresh Green Beans, trimmed and halved
• 1 Tbsp (15 mL) Kosher Salt (for blanching water)
• 3 large Shallots, thinly sliced into rings
• 250 mL (1 cup) Buttermilk
• 60 g (½ cup) All-Purpose Flour (for dredging)
• 1 tsp (5 mL) Paprika (optional)
• 800 mL (3 cups) Neutral oil (e.g., canola) for frying
• 60 g (4 Tbsp or ½ stick) Unsalted Butter
• 60 g (½ cup) All-Purpose Flour (for roux)
• 1 medium Shallot, finely minced
• 225 g (8 oz) Cremini Mushrooms, sliced
• 2 cloves Garlic, minced
• 500 mL (2 cups) Whole Milk, warmed slightly
• 250 mL (1 cup) Low-Sodium Chicken or Vegetable Stock
• 1 tsp (5 mL) Dijon Mustard
• ½ tsp (2.5 mL) Freshly Grated Nutmeg
• Salt and Freshly Ground Black Pepper, to taste
• 60 g (½ cup) Grated Parmesan or Gruyère Cheese (optional)