Greenwood struck in the 3-1 win at London stadium.
And ahead of their Champions League game at RB Leipzig, Solskjaer enthused: "Mason Greenwood is a very talented forward and he is one of the best finishers I have worked with,.
"When we can provide chances for him, of course we have a good chance of scoring goals.
"He is still young and learning, and he will improve with the characters in the team."
United beat RB Leipzig at home earlier in the season and Solskjaer says his side will not "ignore" their previous meeting.
"It's a game we will remember fondly because we did many things right. We also need to correct a few wrongs we had," said Solskjaer.
"We know Leipzig well enough to know they are unpredictable in their shape and their systems. We know it is going to be a tough game and we need to be at our best."