In a large bowl: Beat the sugar and eggs together. Then add the half & half or whole milk, oil, vanilla extract, orange juice and orange zest. Mix well.
Once the mixture is uniform, add in the flour, baking powder, salt, cinnamon. Combine using a mixer mix.
Coat the muffin tin with cooking spray or butter (optional: use muffin paper liner).
Use an ice cream scooper to measure even portions. As you carefully place each scoop of batter in the muffin tin (should be exactly 12 scoops).
Bake for 20-22 minutes or until golden brown. Let the muffins cool in the tin for about 10 minutes and then transfer them to a baking rack to finish cooling completely.