01 - Preheat oven to 425°F. Spread fries on a baking sheet, toss with vegetable oil and salt, and bake according to package directions or until golden and crisp, approximately 20–25 minutes.
02 - While fries bake, cook crumbled chorizo in a large skillet over medium heat until well browned, about 5–7 minutes. Remove with a slotted spoon and set aside, leaving about 1 tbsp of rendered fat in the pan.
03 - Melt butter in the same skillet. Add diced onion and minced jalapeño, sautéing until softened, about 3 minutes. Stir in flour and cook for 1 minute to form a roux.
04 - Gradually whisk in whole milk. Simmer, stirring constantly, until the mixture thickens slightly, 3–5 minutes.
05 - Reduce heat to low. Add shredded cheddar and Monterey Jack cheeses, stirring until fully melted and smooth.
06 - Stir in smoked paprika, cumin, salt, and pepper to taste. Fold in the cooked chorizo, reserving a small amount for garnish if desired.
07 - Arrange baked fries on a serving platter. Spoon chorizo queso dip generously over the fries. Garnish with chopped cilantro, sliced jalapeño, and reserved chorizo. Serve immediately.