Season beef brisket with salt and pepper.
Add oil, garlic and onion to pot with beef brisket.
Sautee until both sides are brown, about 3 minutes each side. Add broth and spices and stir.
Place the lid on the instant pot and seal shut. Close the pressure release valve. Set the instant pot to manual, high pressure for 45 minutes.
When cooking cycle is complete, naturally release pressure for 30 minutes.
Slice and serve with desired sides.