No-Fail Lasagna

Yield: 8 Servings
Categories: Main Dishes
500gOven Ready Lasagna Noodles
4tbButter
1smOnion diced
3tbFlour
2cMilk
3/4cParmesan cheese
3/4tsSalt
2Egg yolks
1lbLean ground beef
6cSpagetti sauce
8ozMozzerella cheese
8ozRicotta OR cottage
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