Healthy Big Mac Casserole

• 2½ cupswater
• 1 lbwhite potatoes — chopped into 2-inch pieces
• 2 lbground beef — or turkey
• 1 cupyellow onion — diced
• 1 cupcarrot — shredded, optional
• 1 cupzucchini — shredded, optional
• 1 tsppaprika
• ½ tspsalt
• ½ tspgarlic powder
• ½ tsponion powder
• 2 cupscheddar cheese — shredded

Toppings:

• —Sliced pickles
• —Chopped lettuce
• —Chopped tomatoes
• —Sesame seeds
• 1 batchHealthy Big Mac sauce