In a bowl, add chicken breast, the onion powder, oregano, paprika, salt and pepper. Mix well to season the chicken breasts evenly.
In a medium skillet, heat 1 tbsp of olive oil over medium-high heat. Place chicken breasts and sear until browned on each side. It’ll take about 5 minutes each side, depending on thickness of the chicken breasts. Transfer to a plate; set aside and keep warm.
In the same skillet, add 1 tablespoon of olive oil and add the mushrooms. Season with salt and pepper and cook until they get brown and crispy. Add the butter and garlic. Sauté until fragrant. It’s about 1 minute.
Return chicken to the pan. Garnish with fresh parsley. Serve immediately with cauliflower rice or regular rice and green salad.
Use an instant-read meat thermometer to check if the chicken has reached an internal temperature of 165F.
You can use a large non-stick skillet if you do not have a cast-iron skillet.
Cutting the chicken ensures that it is thin enough to cook through quickly so it doesn't dry out.
To store: Store the chicken and mushrooms in an airtight container in the fridge for up to 4 days.
To reheat: Reheat the leftovers in the microwave until hot. You can microwave with a damp paper towel over top if you're worried the chicken will dry out.