Identify whether your recipe needs “melting” (tacos, quesadillas, grilled cheese) or just “flavor” (toppings, salads).
Pick the substitute that matches your heat level first: mild peppery heat (Jack varieties) or adjustable heat (add pepper/cayenne).
Swap using the listed ratio, then adjust seasonings: add crushed red pepper/black pepper for heat and a small pinch of salt for tang.
If using a wetter add-in (like diced jalapeños), drain and blot before mixing to prevent grainy melt.
Re-test for texture: if it’s not melting smoothly, increase shred size consistency (or blend two cheeses) for better melt.