Ingredients
- 4 medium (4-inch) firm portobello mushrooms, caps intact
- 1 tablespoon olive oil
- Freshly ground black pepper
- About 1 handful fresh spinach leaves, clean and dry
- 1 medium tomato (8 ounces), not too ripe
- Crushed red pepper flakes (optional)
- About 6 ounces mozzarella cheese, grated
- Dried thyme
- Half a medium bell pepper
- Salt
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