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1
Melt butter in a small saucepan over medium-low heat. Stir flour, salt, and pepper into melted butter until flour is dissolved. Slowly whisk milk into butter-flour mixture until a thick white sauce forms, 2 to 4 minutes. Remove saucepan from heat.
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2
Heat a large skillet over medium-high heat. Cook and stir beef in the hot skillet until browned and crumbly, 5 to 7 minutes; drain and discard grease. Add spaghetti sauce and nutmeg to ground beef; cook until spaghetti sauce is heated through, about 5 minutes.
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3
Preheat oven to 350 degrees F (175 degrees C).
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4
Spread a layer of meat sauce into the bottom of a 9x13-inch baking dish. Cover meat sauce layer with a layer of lasagna noodles; top with 1/3 the white sauce, 1/2 the remaining meat sauce, 1/3 the Mexican cheese blend, and 1/3 the Parmesan cheese, respectively. Repeat 1 more layer of each ingredient; top with 1 more layer lasagna noodles, remaining white sauce, Mexican cheese blend, and Parmesan cheese. Pour water around the edges of the dish. Cover dish with aluminum foil.
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5
Bake in the preheated oven for 45 minutes. Remove aluminum foil and continue baking until cheeses are melted, about 10 more minutes. Let lasagna stand 10 minutes before serving.
