Sauce mushrooms in a frying pan over med-high heat. Slice sundried tomatoes and prepare other toppings in the meantime.
Slice baguette relatively thinly, then top with cheese, mushrooms, sundried tomatoes, arugula and fresh basil. Sprinkle with a pinch of red chili flakes, some black pepper and sea salt.
Cook sandwiches in batches of 5 or 6 in a large frying pan on med-low heat, melting 1-2 tbsp of butter at a time.
Cook for about 3-4 minutes each side until cheese starts to melt and the outside of the sandwiches gets crispy.
Serve immediately with ketchup and sriracha - enjoy!
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2022/05/23/mini-grilled-cheese-sandwich-appetizers/