no, I don't think it is peperomia hoffmannii. I haven't grown that, but in pictures it is very prostrate, ground cover that hangs down over baskets:
https://blog-imgs-38.fc2.com/c/i/t/cityj ... 932b56.jpg
euphorbia covers a wide range of different plants. This is euphobia helioscopa:
https://www.plant-identification.co.uk/i ... copa-3.jpg
I think not yours, but you can see the similarities.
If your plant flowers, it will get easier to identify.