In a large skillet, heat 1 teaspoon of vegetable oil over medium heat. Add the chopped onion and garlic, sautéing until the onion is translucent and fragrant, about 5 minutes.
Once the onions and garlic are ready, stir in the tomato sauce, chicken broth, shredded chicken, 1/4 cup cilantro, chopped jalapeños, chili powder, cumin, oregano, and kosher salt. Mix well and let the filling simmer for about 5 minutes to meld the flavors.
Preheat your oven to 350°F (175°C). Take a flour tortilla, spoon a generous amount of the chicken filling onto the center, and add a dollop of soft goat cheese. Roll the tortilla tightly around the filling and place it seam-side down in a greased baking dish. Repeat with the remaining tortillas and filling.
Pour the enchilada sauce evenly over the assembled enchiladas, ensuring they are generously covered. Sprinkle the Mexican blend cheese over the top.
Bake the enchiladas in the preheated oven for about 25-30 minutes, or until the cheese is bubbly and golden brown.
Once baked, remove the enchiladas from the oven and let them cool for a few minutes. Top with additional fresh cilantro and serve with a side of sour cream for garnish.