1. Mix the red onion, garlic, tomatoes, sundried tomatoes, dried basil, dried oregano, and olive oil together. Season with salt and pepper and set aside.
2. Mix the avocado and sour cream together and season with salt and pepper.
3. Toast your bread on both sides in a hot pan and place them on a piece of parchment paper.
4. Generously spread the tomato salsa on each piece of bread and sprinkle feta cheese over the top.
5. Bake your bruschetta in a preheated oven at 200 degrees Celsius (392 degrees Fahrenheit) for 10-15 minutes and serve them with the freshly chopped basil on top.