The first step is to preheat the oven to 180°C. Cook the spinach in a pan with a pressed garlic clove and a knob of butter, starting the cooking covered to wilt the spinach. Season with salt and pepper at the end of cooking. Let it cool, then roughly chop the spinach.
Beat the eggs with the heavy cream, salt, and pepper. Add the chopped spinach. Line a tart pan with the shortcrust pastry. Prick the bottom with a fork. Sprinkle with breadcrumbs, then pour the spinach and cream mixture.
Slice the Goat Cheese Log into 1 cm thick rounds and distribute them on the tart.
Bake at 200°C (combined heat) for about 35 minutes. Serve the spinach and goat cheese tart hot or warm.