How to Make a Roux:

1. Melt the Butter: Add the butter to your skillet over medium-low heat.
2. Add Flour: Once the butter is melted, whisk in the flour all at once.
3. Cook and Stir: Keep whisking constantly for about 3-5 minutes. The roux should become smooth and start to turn a light blond color. Be careful not to let it burn!

Sautéing Spinach:

1. Prep the Garlic: While your roux is cooking, add the minced garlic to the skillet with the onion. Cook for about 30 seconds, just until fragrant.
2. Add Spinach: If using fresh spinach, add it in batches, allowing each batch to wilt before adding more. Frozen spinach can be added directly after squeezing out excess water.
3. Toss and Cook: Use tongs or two spoons to gently toss the spinach in the skillet. Continue cooking for just 1-2 minutes for fresh spinach, or until heated through for frozen.
4. Don’t Overcrowd: If your skillet is small, it’s better to sauté the spinach in batches to avoid steaming it instead.

Combining Ingredients:

1. Whisk in Milk: Gradually whisk the milk into your roux a little bit at a time. Whisk constantly to prevent any lumps from forming.
2. Simmer and Thicken: Bring the mixture to a gentle simmer, stirring frequently. The sauce will start to thicken. Cook for about 3-5 minutes, or until it coats the back of a spoon.
3. Add Spinach: Stir the cooked spinach into the creamy sauce, gently folding it until completely incorporated.
4. Incorporate Cream Cheese (Optional): If using, add the softened cream cheese and stir until melted and smooth.
5. Season and Adjust: Add the nutmeg, along with salt and pepper to taste. If the sauce is too thick, add a bit more milk. If it’s too thin, cook for a minute or two longer to allow it to thicken.

Seasoning and Adjustments:

The Basics

• Salt and Pepper: These are essential. Start with a small amount and taste as you go.
• Nutmeg: A classic addition! Its warm, slightly sweet spice perfectly complements the creamy spinach.

Getting Creative

• Fresh Herbs: Finely chopped thyme, rosemary, or a touch of parsley add freshness.
• Spice It Up: A pinch of cayenne or red pepper flakes offers a subtle heat.
• Citrus Zest: A little lemon zest brightens the flavors and adds complexity.
• Grated Parmesan: Stir in at the end for extra savory richness and a touch of saltiness.