1. In a large bowl combine the flour, salt, pepper, and garlic powder.
2. Add the beef strips and toss to coat.
3. Transfer beef to a plate, shaking off excess flour. Discard excess flour.
4. Heat a large skillet over medium-high heat. Add oil and heat until very hot.
5. Add beef in a single layer and do not touch for 2 minutes.
6. Flip beef and stir frequently until it is under your desired done-ness. It only really needs a minute or so.
7. Remove from heat. While stirring, slowly drizzle in the beef stock. Put it back on the heat and bring it to a simmer.
8. If you’d like the sauce to be thicker, in a small bowl combine the cornstarch and water until smooth. Add it all at once to the skillet. Stir until it comes to a simmer and thickens.
9. Taste and season with salt and pepper, if desired.

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