Carrot-banana muffins

Ingredients

• 190 gr flour
• 1 tsp baking powder
• 3/4 tsp baking soda
• a pinch of salt
• 1 tsp cinnamon
• 1/2 tsp ground ginger (optional)
• 1/4 tsp ground nutmeg
• 40 ml vegetable oil
• 80 gr butter (melted)
• 2 large eggs at room T
• 200 gr brown sugar
• 80 g bananas (mashed)
• vanilla
• 200g grated carrots (about 3 large carrots)
• chopped nuts, raisins, chocolate, and almond petals for decoration