Brown ground beef and onion in a large skillet. Add garlic powder, spaghetti sauce and oregano. Cook just until thoroughly warmed. Spoon layer of meat sauce onto bottom of greased oblong slow cooker. Add layer of uncooked lasagna noodles, breaking if needed. Top with layer of half remaining meat sauce, half cottage cheese, half parmesan cheese and half mozzarella cheese. Repeat layering and start with more lasagna noodles. Cover and cook on low for 6 to 8 hours.
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