Steps
- Preheat the oven to 400°F / 205°C. Halve 1 baguette lengthwise and scoop out a little of the crumb.
- Heat 1 tablespoon of canola oil in a skillet over medium-high heat. Sauté 300g of finely chopped button mushrooms and 1 small finely chopped onion for 7-10 minutes. Season with salt and pepper.
- Spoon the mushroom mixture into the baguette halves and top with 150g of grated Gouda. Bake for 8-10 minutes, until crisp and golden. Drizzle with 2 tablespoons of ketchup.