Frozen roasted green beans makes for the easiest vegetable side dish for one. These frozen green beans can go straight from the freezer to the mixing bowl to the oven in 30 minutes. They can bake along with your main dishtoo.
Once oven is preheated, toss about 1 ½ cups frozen green beans, 2 teaspoons olive oil, ⅛ teaspoon kosher salt, ⅛ teaspoon garlic powder, and a pinch of black pepper.
Pour out in baking sheet. Arrange in a single layer.
Roast for 20-25 minutes, tossing half way through.
Serve immediately. Add additional toppings/seasonings if desired.
Notes
You can use whole frozen green beans or chopped ones. French green beans (the really thin ones wouldn't roast well).
If substituting fresh for frozen green beans, just check after about 10 minutes of roasting, they likely won't need as long to brown and crisp up in the oven.
You can substitute the green beans for another frozen vegetable. Cooking times may vary though.
Other Topping Ideas: parmesan cheese, lemon juice/zest, red pepper flakes, balsamic vinegar, etc.