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A slab of oven roasted corned beef is sliced thickly on a white plate. There is green, leafy herbs for garnish on the sides.
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4.38 from 8 votes

How to Cook Corned Beef Brisket in the Oven

Roasting corned beef brisket in the oven brings out the savory, flavor of the meat perfectly. This might be the easiest way to cook a corned beef brisket. All you need is the brisket, some pepper, and the roasting pan! The meat comes out tender with a lightly crispy edge that gives the meat wonderful texture. A 3-4 pound corned beef brisket will make 6-8 servings. (Corned Beef is a fatty cut that is brined in water so expect shrinkage in the oven!)
NOTE: Cooking time will very on size of meat, see recipe!
Prep Time5 mins
Cook Time3 hrs 45 mins
Course: Main Course
Cuisine: Irish
Keyword: oven roasted corned beef brisket, st. patrick's day food, how to cook corned beef brisket
Servings: 6
Calories: 551kcal
Author: Mirlandra


  • 1 flat cut corned beef brisket 3-4 pounds
  • Spice packet from corned beef package
  • ¾ teaspoon black pepper coarsely ground


  • Preheat the oven to 325 F.
  • Spray the rack of your roasting pan with non-stick spray. Place in roasting pan.
  • Remove corned beef from package. If you are sensitive to salt you can rinse the brisket now. This will reduce some of the saltiness of the brined meat. Just rinse under cool running water briefly and then place on the roasting rack. (No need to dry it.)
  • Place your meat (rinsed or not) on the roasting rack.
  • Sprinkle the brisket with the seasonings from the spice packet and the black pepper.
  • Cover the dish with heavy aluminum foil and roast in preheated oven for 2 ½ hours.
  • Uncover and continue baking for another 45 minutes.
  • Poke the brisket with a fork. If the fork goes in VERY easily the brisket is ready. If there is any resistance bake for another 30 minutes. Continue to bake and test in 30-minute intervals until the brisket is tender.
  • Slice the brisket against the grain in ¼” slices and serve immediately.
  • Tip: This is a dish that dries out quickly so it is nice to serve it in a covered dish.
  • Serve the corned beef with Colcannon or mashed potatoes!


Calories: 551kcal | Carbohydrates: 1g | Protein: 1g | Fat: 1g | Saturated Fat: 1g | Sodium: 1mg | Fiber: 1g | Sugar: 1g