Spicy Confit Chiles

Name: Spicy Confit Chiles
Yield: Makes about 2 cups
Ingredients: 16 whole medium-hot red chiles with stems (such as Fresno or red jalapeño); 10 garlic cloves, peeled; 1 cup olive oil or ½ cup olive oil and ½ cup vegetable oil; 1 teaspoon kosher salt, plus more