Mussels in white wine sauce with garlic butter toasts

Name: Mussels in white wine sauce with garlic butter toasts
Ingredients: 4 slices sourdough bread; 1 tbsp olive oil; knob of butter; small bunch of parsley, stalks finely chopped (keep the leaves for the butter, and to serve); 1 bay leaf; 1 shallot, finely chopped; 1kg mussels, cleaned and beards removed; 1 glass white wine (I used chardonnay); 40g unsalted butter; 2 garlic cloves; 1 tbsp chopped parsley leaves, plus extra to serve; ½ tbsp tarragon leaves; ½ tsp smoked paprika; large pinch sea salt; 10g parmesan, grated