- 1 tablespoon whipped butter
- 1 tablespoon all-purpose flour
- 1 pinch garlic salt
- 1 pinch kosher salt
- 1/4 cup low-fat milk
- 1 (10 ounce) package frozen chopped spinach, thawed and squeezed dry
- Melt whipped butter in a small saucepan over medium heat; stir flour, garlic salt, and kosher salt into the melted butter until smooth.
- Whisk in low-fat milk, bring to a simmer, and reduce heat to low. Simmer sauce until thickened, whisking constantly, about 1 minute.
- Stir spinach into the sauce and heat until warmed through, 1 to 2 more minutes.