Saute the onion and garlic in the olive oil. Add to blender with the poblano peppers, cilantro, cream cheese, sour cream, chicken broth, salt, cumin, and queso fresco. Blend until smooth.
2 Tablespoons olive oil, ½ medium onion, 4 cloves garlic, 1 bunch of cilantro, 1 (8-ounce) package full-fat cream cheese, 1 cup sour cream, ½ cup chicken broth, ½ teaspoon kosher salt, ¼ teaspoon ground cumin, ½ cup queso fresco