Preheat your oven to 375°F (190°C). Grease or line a muffin tin for 4 muffins.

In a small bowl, whisk together 1 cup all-purpose flour, 1/2 tablespoon baking powder, and 1/8 teaspoon salt.

In another bowl, whisk together 1/2 cup milk, 1 tablespoon olive oil, and 1 large egg yolk until well combined.

Pour the wet ingredients into the dry ingredients and stir until just combined. Be careful not to overmix.

Fold in 1/4 cup crumbled feta cheese and 2 tablespoons diced salami.

Spoon the batter into the 4 muffin cups, filling each about two-thirds full.

Bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.

Allow the muffins to cool in the tin for a few minutes.