oil in a small saucepan over medium-high heat. Add flour and cook for 1 minute, whisking constantly. Add in the chili powder, garlic powder, cumin and oregano and cook for 1 more minute, whisking constantly.

Gradually pour in the stock, whisking constantly to combine until no lumps remain.  Continue cooking until the sauce reaches a simmer.  Then reduce heat to medium-low to maintain the simmer (the sauce should continue lightly bubbling) for about 10-15 minutes, uncovered, until the sauce has slightly thickened.

Give the sauce a taste and season with salt, as needed.  (I typically add 1/2 teaspoon fine sea salt, but the saltiness of the sauce can vary depending on the brand of stock that you use.)

Use immediately in your favourite recipe and enjoy!