You're restaurant is way better than the krusty krab
Plankton was in the city just walking around in the city, and these random fish people walk up to him encouraging him that the chum bucket can surpass the Krusty Krab.
When Plankton arives at the chum bucket, he tells his wife about his encounter with the fish people, and she makes this whole big plan to steal the Krabby Patty Formula
The plan is for plankton to look just like spongebob so he can know what the krabby patty formula is.
Plankton walked into the Krusty Krab and walked straight back to the kitchen. He found the formula and started cooking krabby patties. Plankton had everyone fooled for a while, but then sqiudward realized that it was spongebobs day off, so he went to go tell mr krabs about the imposter. Mr Krabs instantly knew who it was, so he called spongebob and told him to come back to the krusty krab to bust plankton.
Spongebob walks in, and sees his imposter in the kitchen, walked in on him, told him to take his disguise off, then brainwashed him so he don't remember the formula. Then mr krabs threw plankton out like he always does
Plankton spends the rest of his days in his empty resturant, and the Krusty Krab still flourishes like always.