Prep the beans: Rinse and dry the green beans. Trim the stem ends.
If using frozen beans, don’t thaw—just add a minute or two to the cooking time.
Heat the pan: Set a large skillet over medium heat. Add the olive oil and butter. When the butter is melted and foamy, you’re ready to cook.
Sauté the beans: Add the green beans in an even layer.
Sprinkle with salt and pepper. Cook, stirring every minute or so, until they turn bright green and get a few golden spots, about 4–5 minutes.
Quick steam: Add 2–3 tablespoons of water or broth and immediately cover the pan. Steam for 2–3 minutes to soften the beans while keeping them crisp.
Add the garlic: Uncover and push the beans to create a bit of space.
Add the garlic to the butter in the pan. Cook 30–45 seconds, stirring, until fragrant. Toss the beans to coat them in the garlic butter.
Taste and finish: Adjust salt and pepper.
If you like, add a squeeze of lemon, a pinch of red pepper flakes, or a shower of Parmesan. Cook 30 seconds more to meld flavors.
Serve warm: Transfer to a serving dish. Finish with toasted almonds or parsley for a little crunch and color.