Preheat oven to 350 degrees. Coat a deep dish pie plate with vegetable cooking spray and set aside.
Over medium-high heat brown meat or veggie meat (with olive oil) and onion and peppers. Drain if using beef. Stir in oregano, Adobo, salt, black pepper, cracker crumbs, and soup. Pour into the greased pie plate. Set aside.
In a small bowl mix together the egg, milk, salt, mustard powder, Worcestershire sauce, and cheese.
Pour over the burger mixture, spreading cheese to cover top completely. Bake for 30 minutes or until topping is set and golden.