Preheat the oven and arrange the baguette slices on a baking tray, then brush lightly with olive oil and toast until golden and crisp.
Heat olive oil in a skillet, add the minced garlic, and cook briefly until fragrant without browning.
Add the shrimp to the pan, season with salt, black pepper, and chili flakes, and cook until pink and fully cooked on both sides.
Finish the shrimp with lemon juice and remove from heat.
Mash the avocados with lemon or lime juice, salt, and pepper until creamy but slightly chunky.
Spread the avocado mixture over each toasted bread slice and top with garlic shrimp.
Garnish with fresh herbs and serve immediately.