Match your use: sandwiches need creamy slice-and-melt; baking needs smooth melt without a dry, rubbery surface.
Pick the substitute from the Best Matches first; use the listed 1:1 ratio by weight.
For faster, more even melt, shred the substitute (or cut into thin slices) before adding to hot fillings.
If your dish tastes flatter than muenster, add a tiny pinch of salt (and a few drops of lemon juice) rather than more cheese.
Bake/heat until the cheese fully liquefies around edges; pull slightly earlier if your substitute browns faster.