Decide how you’ll use it (grated melt vs. sliced/crumbled); this determines whether you prioritize melt or flavor.
Pick the closest match from the list: red cheddar for flavor/color, colby for smooth melting, or gouda/tilsit for nutty melt.
Substitute using the listed ratio; for wetter dishes (soups, sauces), grate the cheese to help it melt evenly.
Taste and adjust seasoning: if the swap is saltier (many blends/cheddars), hold back salt until the dish is hot.
For bakes and toast, watch for bubbling and slight browning—this is when the substitute’s melt behavior matches red leicester.