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Preheat oven to 375 degrees. Bring a large pot of salted water to a boil then add the cauliflower florets and boil until al dente (don’t over boil!) 3-4 minutes. Drain then set aside.
Meanwhile, melt butter in a small saucepan over medium heat then sprinkle in flour and cook for 1 minute while whisking constantly. Slowly pour in milk while whisking then turn heat up to medium-high and bring to a simmer while whisking constantly. Turn heat back down to medium then simmer for 1 minute or until milk has thickened, still stirring constantly. Remove pan from the heat then add 1/2 cup each gruyere and parmesan cheeses and stir until smooth. Season with salt and pepper to taste.
Add enough of the cheese sauce to thinly coat the bottom of an 8x11” baking pan. Add cauliflower florets then cover with remaining sauce. Top with remaining cheeses then bake for 30-35 minutes or until cheese is golden brown and bubbly. Broil for a few minutes at the end if you want a darker top.