easy cheesy chicken enchilada bake

Ingredients

• 1-2 box old elpaso enchaladas kit
• 1-3 pound ground chicken or 1-2 rotisserie chickens (all of the meat)
• 1 package mexican blend shredded cheese
• 1 can sliced olives
• 2-4 medium flour tortillas
• 1 medium onion chopped
• 1-2 tablespoon butter
• - cooking spray
• 1 1/2 teaspoons onion powder
• 1 1/2 teaspoons minced garlic
• 1 teaspoon salt
• 1 teaspoon pepper
• 1 1/2 teaspoons garlic powder