Preheat oven to 425°F. Line a small baking sheet with parchment paper.
Wash and thoroughly dry green beans. You can use paper towels, napkins or a clean kitchen towel to pat them dry.
Use a knife or kitchen scissors and trim any stems from green beans.
In a small bowl, combine vegetable oil, vinegar, ranch powder, salt, pepper, garlic powder, and red pepper flakes.
Whisk ingredients together until well combined.
Add green beans to bowl and toss in oil mixture until beans are well coated.
Spread prepared green beans evenly on cookie sheet.
Bake in oven for 15 minutes.
TIP: Green beans will still be somewhat crunchy. If a softer texture is desired, turn off oven and allow to sit in closed oven for 10 minutes. This will soften the beans.
Place roasted green beans in a bowl and toss with grated parmesan cheese and sliced almonds and serve.