Preheat the oven to 350°F (175°C). Lightly coat the interior of a 9x13-inch baking pan with non-stick spray or a thin layer of oil.
In a frying pan set over medium heat, cook the bacon until browned and crisp. Transfer to a plate lined with paper towels to drain excess grease, then crumble once cooled.
In a mixing bowl, combine the melted butter, brown sugar, soy sauce, garlic powder, and black pepper. Whisk until the mixture becomes smooth and cohesive.
Spread the drained green beans evenly across the greased baking dish. Drizzle the prepared sauce over the beans and gently toss to ensure the beans are well coated.
Evenly scatter the crumbled bacon over the top of the green bean mixture.
Place the dish uncovered into the preheated oven and bake for 25 to 30 minutes, until the sauce becomes bubbly and thickens slightly.
Serve hot for a dish that balances savory depth with a hint of sweetness.