Are you looking for big returns to supercharge your investment portfolio?

If you answered yes to this question, then it could be worth taking a look at the two ASX 200 shares listed below that brokers are recommending to clients. Here's what you need to know:

Domino's Pizza Enterprises Ltd (ASX: DMP)

The team at Ord Minnett believes that this pizza chain operator could be an ASX 200 share to buy for big returns.

While it was surprised with news that its CEO is stepping down, it is sticking with the company and urging investors to snap up its shares while they offer very attractive value. It said:

Domino's Pizza Enterprises announced the surprise exit of CEO Mark van Dyck, effective in December, despite him only taking the top job in November last year. Veteran fast-food tycoon Jack Cowin, Domino's major shareholder, will become executive chairman until a new CEO is appointed.

This suggests to Ord Minnett that the turnaround job at the fast-food chain may be a much larger task than Van Dyck – and the market – expected, despite what appeared to be the CEO's apparent rapid progress in resetting the business, e.g. the closure of 205 loss-making stores in Japan and Europe. It may well be that Cowin, who made his fortune with the Hungry Jack's franchise, did not see changes to the business being deep enough or implemented fast enough. […] We have raised our recommendation to Buy from Hold given the very attractive value now on offer.

Ord Minnett has a buy rating and $28.00 price target on its shares. Based on its current share price, this implies potential upside of 54% for investors over the next 12 months.

Northern Star Resources Ltd (ASX: NST)

Analysts at Macquarie are bullish on this gold miner and believe it could be an ASX 200 share to buy now.

While the broker acknowledges that FY 2025 was a disappointing year, it appears to see recent share price weakness has an overreaction and a buying opportunity for investors. Commenting on its recommendation, the broker said:

Outperform. Most key metrics (inc. FY26 guidance) were released prior. AISC was in line, while net cash was softer than expected, with cash from the DEG takeover less than we anticipated. The KCGM site visit now presents a key catalyst, with NST expected to give a little more colour on the outlook.

Macquarie has an outperform rating and $25.00 price target on the company's shares. Based on its current share price, this suggests that upside of almost 60% for investors is possible between now and this time next year.