Preheat oven to bake 180 degrees Celsius. Grease a non-stick 12 hole muffin tray with olive oil.
Sift plain flour into a large mixing bowl. Add all remaining dry ingredients, reserving 12 single pecans to garnish with later. Mix until evenly incorporated.
Into another bowl add wet ingredients and whisk until smooth.
Add wet to dry ingredients and gently mix with a spatula until just incorporated.
Evenly divide batter into the muffin tray. Garnish each with a single pecan.
Bake for 20-22 minutes, or until cooked through.
Remove from oven and let the tray sit for five minutes. Using a small cheese knife, gently loosen the muffins from their holes and then let cool on a cooling rack.