Bacon Cheeseburger Tater Tot Hotdish

lbs. lean ground beef

unsalted butter, divided

large red onion, chopped

sliced fresh button mushrooms

large cloves garlic, minced

all-purpose flour

Worcestershire Sauce

whole milk

c. sour cream

diced hamburger dill pickle slices (if you are especially fond of pickles, add even more!)

Lawry’s seasoning salt, plus more for sprinkling over the tater tots

black pepper, plus more for sprinkling over the tater tots

chopped fresh parsley

Crystal Farms Bacon Cheddar, cut into 1/2″ cubes

Crystal Farms Sharp Cheddar, cut into 1/2″ cubes

lbs. frozen tater tots

cooked, chopped bacon, for additional bacon flavor

red onion slices

hamburger dill slices

fresh cherry tomatoes, halved

chopped fresh parsley

ketchup

mustard