Place green beans in a pot and cover with water; bring to a boil. Reduce heat to medium-low and simmer until beans start to soften, about 10 minutes. Drain water, leaving beans in the pot.

Place bacon strips on a microwave-safe plate and cook in the microwave until crisp, about 2 minutes. Cool and crumble bacon.

Stir butter and bacon into beans in the pot and return to medium heat; cook and stir until butter melts, 2 to 3 minutes.