Cook the egg noodles according to package instructions. Drain and set aside.
12 ounces egg noodles
While the noodles are cooking, cut the sirloin into 2 pieces lengthwise. Then cut into 1/8 inch thick strips. Toss the meat with Worcestershire sauce and thyme in a medium bowl.
1 pound top sirloin steak, 1 tablespoon Worcestershire sauce, 1 teaspoon dried thyme
Heat vegetable oil in a large skillet over medium-high heat. Add the steak and cook for 1 to 2 minutes, until mostly browned. Remove from the pan and set aside.
1 tablespoon vegetable oil
Melt the butter in the pan used to cook the steak. Add the mushrooms, onion, and garlic to the skillet, cooking until the onions are translucent, about 5 to 7 minutes.
2 tablespoons butter, 8 ounces cremini mushrooms, 2 cloves garlic, 1 small yellow onion
Add the paprika, salt, black pepper, and flour, stirring it into the mushrooms until well combined. Slowly whisk in the wine, scraping up the browned bits, about a tablespoon at a time, adding more liquid once what you just added is absorbed. While we want to go slow here, the whole process should take less than a minute. Whisk in the beef broth.
1 teaspoon paprika, 1 teaspoon kosher salt, 1/4 teaspoon black pepper, 3 tablespoons all purpose flour, 1/2 cup white wine, 1 cup low sodium beef broth
Turn the heat up and bring the liquid to a boil. Reduce to a simmer and allow to reduce for about 2 minutes.
Remove from the heat and stir in the sour cream, then return the beef and any acquired juices to the pan. Taste the sauce and add more salt and pepper as needed. (At this point I typically add another 1/2 teaspoon of kosher salt and another dash of black pepper.) Serve with the noodles and enjoy!
1/2 cup sour cream