In a skillet over medium heat, add 1 tablespoon of olive oil. Sauté the mushrooms until they start to brown, then add the chopped spinach, green onion, garlic powder, jalapeño (if using), salt and pepper. Cook for another 2-3 minutes until the spinach wilts.
1 tbsp olive oil, 1 cup mushroom, 1 ½ cup spinach, ¼ cup green onion, 1 tsp garlic powder, 1 tbsp Jalapeño, ¼ tsp salt, ¼ tsp pepper