Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper.
Wash and trim the green beans. Pat them dry with a towel.
In a large bowl, toss the green beans with 2 tablespoons of olive oil, garlic powder, smoked paprika, salt, and pepper.
Spread the seasoned green beans evenly on the prepared baking sheet.
Caramelizing the Onions
In a skillet over medium heat, add 1 tablespoon of olive oil. Add the thinly sliced onions and cook until they become translucent and start to caramelize, about 10-12 minutes.
Stir in the balsamic vinegar and cook for another 2 minutes. Remove from heat and set aside.
Cooking the Bacon
In the same skillet, cook the chopped bacon until crispy. Remove and drain on a paper towel.
Roasting
Place the baking sheet in the preheated oven and roast the green beans for 20-25 minutes, or until they are tender and slightly crispy at the edges.
Remove the green beans from the oven and immediately top with caramelized onions and crispy bacon.
Sprinkle grated Parmesan cheese on top for an extra layer of flavor.
Notes
Green Beans: Want them to keep that bright green color? Quick tip: dunk them in boiling water for a couple of minutes, then straight into ice water. Stops the cooking and keeps 'em green.
Caramelized Onions: Slow and steady wins the race. Don't rush these babies; let them get all golden and sticky on medium heat. It's a game-changer.
Bacon: Wanna save some time? Throw the bacon on a separate tray in the oven while the green beans are doing their thing. Just keep an eye on it so it doesn't get too crispy.
Seasoning: Don't hold back. Give those green beans a good toss in the seasoning. You can always add more, but you can't take it away, so taste as you go.
Cheese: If you're going for cheese, add it right when those beans come out of the oven. It'll melt just enough without disappearing into the dish.
Cooking for a Crowd: Doubling the recipe? Use two baking sheets. You don't want to crowd the pan; otherwise, the beans will steam instead of roast.
Extra Veggies: Feeling adventurous? Toss in some sliced bell peppers or cherry tomatoes for extra color and flavor. Just add them to the pan with the green beans.
Leftovers: Got some extras? Store them in a container but leave the lid a bit open at first to let out the steam. Keeps the bacon from getting all soggy when you reheat it.