Southgate made 10 changes to his starting XI, with the likes of Rashford, Fabian Delph and Danny Rose all catching the eye, ahead of England's World Cup opener against Tunisia. BBC say 4%, but should it be higher?
Ruben Loftus-Cheek was bright in the early stages, bringing the ball forward from midfield with authority and playing a neat first-touch pass off his in-step after venturing to the edge of the Costa Rica box.
England start their World Cup Group G campaign in Russian Federation against Tunisia on June 18 and they will head into that fixture in Volgograd in good spirits after two friendly wins.
England were in the ascendancy and Rashford was exciting the Yorkshire crowd with a number of flashy touches and silky skills.
"You work on them (goals) in training every day and when one comes up in a game it's a reward", Rashford told ITV. A random appointment? No. Southgate specifically asked for an Asian official to take charge as he wants his players to experience different styles of refereeing.
Rashford's "flip-flap" was among those moments of excitement and earned an eighth-minute corner from which Phil Jones sent a looping header that was tipped over by Costa Rica's star man Keylor Navas.
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The resulting set-piece was met by Harry Maguire, who diverted a free looping header towards the bottom corner, but Bryan Oviedo hacked it off the line.
It was Costa Rica's only threat in a dominant first-half display by England.
However, Welbeck also justified his inclusion in Southgate's squad by coming off the bench to seal the win 14 minutes from time as he headed home Dele Alli's cross.
"The players have a good mentality and we have great competition for places in all positions".
Rashford had a disappointing end to United's Premier League season, and Southgate felt he may have been trying too hard.
After a cagey start to the second half, England began to find their rhythm again, with ht slickness in their passing dragging the Costa Ricans all over the places.
After the game, Rashford said he believed "anything's possible" when discussing England's chances of winning the tournament.