Clean, wash and cut the spring onions into rings. Heat oil in a pan. Fry the spring onions and diced ham for 2-3 minutes. Take them out of the pan and let them cool down a bit.
Mix crème fraîche and leek onion and ham mixture and season with a little salt and pepper. Open the baguette roll according to the package instructions. Remove the roll of dough, unroll it at the cutting point and separate it into 4 rectangles.
Halve each rectangle in the middle to make 2 squares each. Roll each square out lengthwise (approx. 15 cm long) and place on a baking tray lined with baking paper. Spread the spring onion mixture on top and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for 12-14 minutes.
Arrange in a basket and serve garnished with parsley as desired.