2 Tsp vegetable oil, divided

2 lbs shaved steak

1 Tsp Worcestershire sauce

3 Tsp garlic salt, divided

1 medium green bell pepper, chopped

1 medium red bell pepper, chopped

4 Tbsp salted butter

1 medium yellow onion, diced

3 cloves garlic, minced

⅓ C all-purpose flour

4 C beef broth

2 C whole milk

1 C half-and-half

2 ½ lbs Yukon gold potatoes, cubed

1/2 Tsp dried oregano

1/2 Tsp crushed red pepper flakes

1/4 Tsp cayenne pepper

1/4 Tsp black pepper

1/2 C white American cheese

1/4 C provolone

1 Tsp dried parsley