Preheat oven to 425°F (220°C)
Slice baguette into 1/2-inch (1–1.5 cm) pieces
Arrange slices on a baking sheet
Brush both sides lightly with olive oil
Bake 6–10 minutes, flipping halfway, until golden and crisp
Remove and cool slightly
Rub warm crostini with a cut garlic clove (optional)
Top with desired toppings, such as:
Tomato-basil: diced tomatoes, minced basil, olive oil, salt, pepper, balsamic (optional)
Ricotta-herb: ricotta, lemon zest, chopped herbs, olive oil, salt, pepper
Mushroom: sautéed mushrooms, garlic, thyme, parmesan, black pepper
Prosciutto-fig: fig jam, mascarpone or goat cheese, prosciutto, arugula (optional)
Avocado: mashed avocado, lime juice, chili flakes, salt, pepper
Serve immediately or return to oven 1–2 minutes if toppings need warming