Restaurant Style Mexican White Cheese Dip My Easy Queso

Ingredients

• 1 tablespoon vegetable oil (15 ml)
• 1/2 cup finely chopped white onion (60g)
• 1 jalapeno pepper, seeded and minced (or more, to taste - optional)
• 1/2 teaspoon ground cumin (2.5 ml)
• 1/4 teaspoon garlic powder (1.25 ml)
• 8 ounces (225g) white American cheese, cubed
• 4 ounces (113g) Monterey Jack cheese, shredded
• 4 ounces (113g) Queso Quesadilla cheese, shredded
• 1/2 cup (120ml) milk, or more to desired consistency
• Pinch of salt, or to taste