Step 1: Preheat your oven to 350°F (175°C). This ensures that your muffins bake evenly.
Step 2: Line a muffin tin with paper liners or lightly grease it with cooking spray.
Step 3: In a large mixing bowl, whisk together the flour, sugar, salt, baking powder, and baking soda.
Step 4: In another bowl, combine the olive oil, milk, eggs, orange zest, and orange juice with Grand Marnier. Whisk until smooth.
Step 5: Pour the wet ingredients into the dry ingredients. Gently fold together with a spatula.
Step 6: Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
Step 7: Bake for about 18-22 minutes, or until a toothpick inserted comes out clean.
Step 8: Allow to cool in the tin for a few minutes before transferring to a cooling rack.
