Heat oil in a large saucepan over medium heat. Add the onions and garlic and cook until softened, about 5 minutes. Add the basil, bay leaf, and chickpeas; stir for 1 minute.
Pour in tomatoes with juices and stock. Bring to a boil then reduce heat to a simmer for 10 minutes. Stir in spinach, ½ cup Astro BioBest yogourt and season with salt and pepper. Cook until spinach has wilted and yogourt is completely incorporated.
Before serving, lightly toast baguette slices. Remove and discard bay leaf from stew. Divide stew between bowls and serve with a dollop of Astro BioBest yogourt, freshly chopped parsley and toasted baguette.