Baked white fish with Onions, Peppers, Olives, and Feta

Ingredients

• 3 filets medium-sized uniformly-thick white fish
• tilapia
• fish
• orange roughy
• orange roughy
• cod
• cod
• sole
• 1/2 tablespoon olive oil or less, depending on your pan
• 1/2 cup red pepper very finely diced
• 1/4 cup diced red onion very finely, or sweet white onion
• 1/4 cup green olives very finely diced, or try chopped capers if you're not a fan of green olives
• 1/3 cup crumbled feta or less if you're not wild about feta
• 2 tablespoons mayo or lite mayo, I would not use fat-free mayo, which usually has added sugar.