Step 1

Combine the chipotle pepper, adobo sauce, and 1/2 cup of the chicken stock in a blender. Blend until the chipotle pepper completely blends down with no solids remaining.

Step 2

Heat the oil in medium saucepan over medium-high heat. Add the flour and whisk for 1 minute, making sure the mixture doesn't stick to the bottom of the pan. Add the tomato sauce, chili powder, garlic powder, cumin powder, dried oregano, onion powder, and salt. Continue to whisk and add the chipotle pepper mixture. Once the sauce starts to thicken, add the chicken stock 1/2 cup at a time. When the sauce is just thick enough to coat the back of the spoon, remove from heat.