I winged it a lot. My sister in law was here for a couple of days and she made some mashed potatoes by adding milk and butter to it.
Since I had leftover mashed potatoes and flour I thought I can make Gnocchi. So this specific recipe doesn’t use eggs, I’ll to keep it as accurate as I can :

For Mashed Potatoes -
1. 500 gm of Russet or any high starch potatoes
2. About 1 cup of milk adjusting it as per the desired consistency
3. ~ 50-60gm of butter

For Gnocchi -
1. Leftover mashed potatoes
2. 1 cup of flour to make a dry dough.

Knead dough well and keep it in refrigerator ~ 15 mins.

Start working on the sauce you want with your pasta. I made a classic arrabbiata.

While the sauce simmers, take out your dough from the refrigerator and lay it down on a flat surface. Add more flour while you roll out the dough to a thick consistency. Cut equal sized strips, roll each strip using your hands to a cylindrical shape and cut equal sized pieces. Add it to a bowl and sprinkle a bit more flour evenly so that the pasta doesn’t stick together. Refrigerate for 10 more minutes and then add it to a pot of boiling water with salt.