Sunny's Bacon Cheeseburger Casserole

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Beef:

8 strips bacon, chopped

1 tablespoon olive oil 

2 pounds ground chuck (80 percent beef, 20 percent fat) 

2 teaspoons onion powder 

2 teaspoons garlic powder 

2 teaspoons Mexican oregano 

2 teaspoons kosher salt 

1 teaspoon freshly ground black pepper 

Sauce:

1 tablespoon unsalted butter

1 tablespoon all-purpose flour 

2 cups whole milk, at room temperature 

1 pint (2 cups) heavy cream, at room temperature 

2 tablespoons yellow mustard 

Kosher salt

Casserole:

2 pounds frozen cheese ravioli, thawed

8 slices Swiss cheese

2 plum tomatoes, seeded and chopped 

8 slices American cheese

8 ounces shredded Cheddar and Monterey Jack cheese blend

1 head iceberg lettuce, finely shredded (like straw) 

1/4 cup thinly sliced red onion (like paper thin!) 

2 tablespoons pickle juice