Spinach Cremini Omelet

INGREDIENTS

• 1 pinch pepper, to taste
• 1 tablespoon olive oil
• 1/8 teaspoon cayenne pepper
• 8 ounces cremini mushrooms, sliced
• 1 pinch salt, to taste
• 1/2 cup sharp cheddar, shredded
• 2 tablespoons unsalted butter
• 1/4 teaspoon paprika
• 1/4 teaspoon nutmeg
• 4 eggs
• 1/4 teaspoon dried oregano
• 5 ounces frozen spinach, thawed and squeezed dry
• 1/4 cup milk