Spinach and Cheesy Artichoke Bella Burgers

1. Preheat your oven to 400ºF. Drizzle the mushroom with the teaspoon of oil and sprinkle with salt. Roast on a baking sheet for 10-15 minutes, or until tender and golden.
2. Meanwhile, heat a skillet over medium heat. When warm, add a tablespoon of water to the skillet and throw in the spinach. Stir until wilted and remove to a bowl.
3. Toss the warm spinach with the artichoke hearts, cream cheese, and parmesan cheese. Season with salt and pepper.
4. Place the roasted portobello on a slice of sandwich bread. Top with the spinach and artichokes and remaining slice of bread.