Here's why the stock has a lot of potential upside.Toast (TOST 0.98%) unexpectedly turned a profit in the second quarter, but its shares were still unable to gain any traction following its strong results and increased guidance. Shares of the cloud-based restaurant management software company are up over 25% year to date, but well off its recent highs.Let's look at the company's most recent quarterly results, future prospects, and valuation to see if this is a good time to buy the beaten-down stock.Increase ...