If your cube steaks are thicker than 1/4", you will want to pound them out until they are a uniform 1/4".
In a shallow dish, or gallon zip top bag, mix together the flour and spices. Dredge the meat in the flour and shake off the excess.
Heat a cast iron skillet over medium high heat, add a drizzle of oil to coat the bottom of the pan. Sear the steaks for 3 - 4 min per side, remove from pan and set aside.
If needed add a bit more oil to the pan and saute the mushrooms and onions together for 8 minutes, add garlic and saute for another 30 seconds.
In a small dish, whisk together gravy mix or cornstarch with 3 tablespoons of beef broth. Set aside.
Add the remaining broth and beef base to the pan, deglazing it and scraping any brown bits from the bottom. Bring to a boil and whisking, drizzle in dissolved gravy mix until desired thickness.
Add steaks back into the pan with the gravy and simmer for 2 minutes. Add another splash of broth and stir if the gravy is too thick.
Serve over mashed potatoes, egg noodles or rice. Or serve on it's own with your favorite sides.
Notes
Can be stored in an airtight container in the fridge for up to 4 days or in the freezer for up to 3 months. Reheat on the stove in a covered pan over low heat until it reaches 165℉.