Italian or Mexican Popover Casserole

This recipe is a real crowd pleaser, and it is very easy to make!  There are two different variations for the filling, so it's like getting two recipes all in one!  :0)  I toss together a quick salad or cut up some fresh veggies and dinner is served! 

Ingredients for Italian Filling:
1.5 pounds ground meat (I use half beef and half turkey)
1 small onion--diced
1 small green pepper--diced  (In all honesty I never add this)
1/2 teaspoon oregano
1/2 teaspoon salt
1 clove garlic--minced
1 jar spaghetti sauce
8 oz mozzarella--shredded

Ingredients for Mexican Filling:
1.5 pounds ground meat (I use half beef and half turkey)
1 small onion--diced
1 cup frozen corn
1 jar of salsa
1 teaspoon chili powder
1/2 teaspoon salt
8 oz cheddar or Mexican blend cheese--shredded

Ingredients for Popover (Used regardless of what filling you use):
1 cup milk
1 tablespoon oil (I use olive oil)
2 eggs
1 cup flour
1/2 cup Parmesan cheese
1/2 teaspoon salt

Directions:
Filling:
Brown meat and add all of the filling ingredients except for the cheese. 
Simmer for 10 minutes or so.
Lightly spray a 9x13 inch pan with cooking spray.
Pour the filling into the pan and top with cheese.
Set aside.
Popover Topping:
Beat milk, oil, and eggs for 1 minute at medium speed. 
Add in the flour and salt and beat for 2 more minutes, or until smooth.
Pour batter over the filling mixture. 
You want all of the filling covered with the batter, so spread it with a spatula if you have to. 
Top with Parmesan cheese.
Bake at 400 for 25 to 30 minutes.

I have even cooked the filling ahead of time, and put it into the fridge.  Then when I am ready to cook it, I whip up the popover batter and pour it over the top.  It works great!  I have also found that for the Mexican version, if your salsa has a lot of onion chunks in it, skip the diced onion for the filling.  Otherwise, it just gets too overpowering!  This recipe is just different and fun.  Jay likes to put his with the popover side down and eat it like a slice of pizza!  Yummy!