Step 1

Heat a skillet on the stove over medium heat and add vegetable oil. Once hot, add sliced yellow onion and cook, stirring occasionally, until the onions begin to caramelize, about 10-15 minutes. Stir in minced garlic and cook until fragrant, about 30 seconds to 1 minute.

Step 2

Push the onions and garlic to the side of the pan. Add butter to the center of the pan and, once it melts, mix in flour. Continue to stir until the mixture becomes golden.

Step 3

Slowly add chicken broth while continuously whisking to remove any lumps. Then, mix the mixture with the onions and garlic, scraping up any brown bits from the bottom of the pan. Bring the broth to a boil, then reduce to medium-low and simmer until it starts to thicken, about 15 minutes.