Heat olive oil and butter in a large skillet over medium heat until butter melts.
Add minced shallot and cook until translucent, about 2 minutes.
Stir in minced garlic and cook until fragrant, about 1 minute.
Sprinkle flour over the mixture and whisk constantly to form a smooth roux, about 1 minute.
Slowly whisk in milk and bring to a gentle simmer; cook until sauce thickens, about 3–4 minutes.
Season sauce with nutmeg and half of the salt and pepper.
Stir in Parmesan (if using) until melted and smooth.
Spinach
Add spinach in batches, stirring until wilted before adding more.
Once all spinach is incorporated, taste and add the remaining salt and pepper as needed.
Serve hot.
Notes
After wilting, squeeze spinach in a clean towel or cheesecloth to remove excess water.For a richer sauce, substitute half of the milk with heavy cream and finish with extra Parmesan.
Nutrition
Serving: 200gCalories: 180kcalCarbohydrates: 7g
Keyword creamed spinach recipe, creamy spinach, easy spinach recipe, spinach side dish, Vegetable Side