Can I make creamed spinach ahead of time?
Yes. Prepare up to 2 days ahead, store in an airtight container, and reheat gently on the stovetop over low heat, stirring occasionally. Add a splash of milk if the sauce thickens too much.
What's the best way to prevent a lumpy sauce?
Whisk the flour into melted butter to form a smooth roux before adding cold milk slowly while whisking constantly. Avoid high heat, which can cause lumps.
Can I substitute Gruyère with another cheese?
Yes. Swiss cheese, Emmental, or aged cheddar work well. Avoid pre-shredded varieties, which contain anti-caking agents; use freshly grated for best melting.
How do I know when the spinach is done cooking?
The spinach will wilt and darken slightly, and excess moisture will evaporate. This typically takes 3–5 minutes after adding to the sauce.
Does this recipe scale easily?
Yes. Double or halve all ingredients proportionally. The cooking time remains about the same for wilting the spinach.