quick fix

a quick fix (an easy and expedient solution to a problem that can be done quickly, but is not a good, esp. one producing results that are temporary, illusory, or counterproductive) {US} — скороспелое, поспешное решение; тяп-ляп — и готово; ...

Example 1: ...
Example 2: ...
Example 3: ...

Example 4: The truth about dieting is that there is no quick fix. Weight must be lost gradually, over a period of time.— ...нет быстрых решений, нет простых решений; нет легких путей

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see also
[silver bullet]
[short cut]
[cut corners]