1. Preheat the oven to 400 degrees Fahrenheit.
2. Get a baking dish to place the crab legs.
3. In a mixing dish, you can combine olive oil, garlic, and cajun seasoning. Mix until everything is well combined.
4. You can separate the oil mixture into two bowls, one of which should be set aside.
5. Proceed to cover the oven dish with aluminum foil after brushing the oil mixture on the crab legs.
6. You bake the crab legs for 10 minutes in the oven.
7. After removing the crab legs from the oven, you can brush them with the remaining oil mixture.
8. Go on and bake for an additional 10 minutes after covering the crab legs with foil.
9. After removing the crab legs from the oven, brush them with the other oil mixture you set aside.
10. Serve and enjoy the dish.

You can watch this video recipe to know how to cook snow crab legs in the oven.