Place dates in a small baking sheet. Drizzle them with olive oil.
Bake for 10-12 minutes in the oven. Let cool on the counter for 5 minutes.
Mix the Maille Honey Dijon Mustard with the mascarpone cheese, fill each date with a teaspoon. Top the dates with honey, pomegranate seeds, and walnuts. Sprinkle them with flaky sea salt.