Heat a large frying pan over medium heat. Add the bacon pieces and cook for 4-6 minutes, stirring occasionally, until the bacon is mostly cooked.

Add the butter, diced onion, and minced garlic. Cook for about 4 minutes, stirring often, until the onion is translucent and the garlic is fragrant.

Add the drained green beans to the pan and stir to combine.

Continue cooking until the green beans are warmed through and coated in the bacon, butter, and onion mixture.

Season with black pepper to taste and serve warm.