Not clear how OP defines "easily."
There are several online stock market services where you can put in money once (or set up an automatic periodic transfer), and just ignore it. I put in a hundred dollars 297 days ago in one of them and looked two minutes ago for the first time in months. I would call that "easy."
It's now $104.82, which is a return of about 5.9%/year.
My IRA (also based on stocks) has done the equivalent of 6.89%/year while I haven't done anything to it in 322 days. I would also call that easy.
Inflation (USA) during that time has been less than 2.5%, so clearly making money this way is possible.
(One might say, "Yeah, but you're not getting rich." Well, having had beds and meals in two dozen countries since retirement, I feel like I'm already rich. Or to look at it another way, my Social Security alone is more than a dozen times the income of half the people in the world.)