Turn on the oven to 375°. Combine and sift together flour, salt and baking powder in a bowl and set it aside.
In a medium sized mixing bowl, cream butter and sugar with an electric mixer until fluffy. Beat in the eggs one at a time, then stir in vanilla extract, greek yogurt and chopped candied oranges.
Gradually stir in the dry ingredients to the mixing bowl using a silicone spatula or a wooden spoon and do not to overmix. Fill each muffin tin with the batter and place one slice of candied orange on top of each muffin.
Bake for 20-25 minutes or until a toothpick inserted into the center of muffin comes out clean. Let the muffins cool, then remove from muffin tin and cool on wire rack. Drizzle extra orange syrup on top of muffins before serving.