Fiesta Lasagne

• 9 lasagne (pieces)
• 1/2 reserved -for the top
• 500 ml tomato sauce
• 350 gr beef (lean ground)
• 250 gr low-fat cottage cheese
• 240 ml low-fat sour cream
• 230 gr cheddar cheese (grated)
• 230 ml picante sauce
• 150 gr corn (frozen thawed)
• 140 gr green chilies (canned diced)