Prepare the ingredients by slicing the peppers and mincing the garlic.
Season the beef fillet steaks generously with salt, pepper, and oregano.
Heat the olive oil in a skillet over medium-high heat.
Sear the beef steaks for approximately 3-4 minutes on each side.
Remove the steaks from the skillet and let them rest.
In the same skillet, add the garlic, followed by the sliced peppers.
Cook the peppers for about 5-7 minutes until they are tender.
Slice the rested beef fillet and serve with the sautéed peppers.