Step 1

Heat oil in a skillet over medium-high heat. Saute onion until soft. Add garlic and cook for 1 minute.

Step 2

Reduce heat to medium. Add green chiles, broth, cumin, oregano, salt, pepper, and optional jalapeno.

Step 3

Simmer, uncovered, for 15 minutes until the liquid is reduced by about 25%, about 3 cups in volume.

Step 4

Use an immersion blender to blend ingredients to your desired consistency. If you don't have an immersion blender, transfer to a regular blender and pulse until the desired consistency is reached. Adjust seasoning to taste.

Step 5

If the sauce is for later use, let it cool, then store it in an airtight container for storage in your refrigerator or freezer.