Remove from heat and add blended cottage cheese, spinach, chicken, Parmesan cheese & pasta.
Stir to combine. (Or, if you are like me and choose a pot that is too small to fit everything, skip this step and mix it all together in your baking dish, oops.)
Place in lightly sprayed casserole dish.
Bake at 375 degrees F for 30 minutes.
Traditional Florentine preparations rely heavily on heavy cream to bind sauces. This version swaps rich dairy for ricotta and parmesan, lightening the final casserole while maintaining a thick consistency. Success depends entirely on moisture control. Thawed frozen spinach acts like a sponge. Squeeze the greens inside a clean kitchen towel until completely dry before blending them into the cheese. Excess water thins the sauce during baking at 375 degrees F and breaks the emulsion.
The Rux of the Roux
Building the sauce base requires proper starch activation. Cook the flour and olive oil together for exactly 30 seconds while whisking constantly. This eliminates the raw flour taste without browning the fats. Pouring the chicken broth in gradually prevents lumps from forming. Whisk continuously for three minutes until the liquid thickens enough to coat the back of a spoon.
Storage and Freezing
Assembled casseroles hold well in the refrigerator for up to 48 hours before baking. Freezing unbaked portions works effectively if wrapped tightly in plastic wrap and aluminum foil for up to one month. Thaw frozen dishes completely in the refrigerator overnight before baking.