Mexican Cornbread Casserole

Ingredients

• Vegetable oil
• 1 pkg Cornbread or -muffin mix (or make equivalent from scratch)
• 1 Egg
• 1/3 cup milk
• 3/4 cup frozen whole kernel corn (will be divided)
• 1/2 pound Lean ground beef* (See Note 1)
• 1/2 cup Spanish onions (coarsely chopped)
• salt
• pepper
• 1 tablespoon Chili powder (or TexMex spice blend)
• 1/2 teaspoon ground cumin
• 8 oz. each Enchilada or tomato sauce (or one 16 oz. can of either)
• 10 oz. Diced Tomatoes & Green Chilies -- drained (drained)
• 2 teaspoons dried oregano (Mexican oregano preferred)
• 1/4 cup black olives (drained, sliced, divided)
• 1 cup shredded Mexican cheese blend
• sour cream
• Fresh cilantro