Preheat oven to 350° F. Grease two 6-count donut pans and set aside.1
In a medium mixing bowl, whisk together flour, ginger, cinnamon, ground cloves, ground all spice, baking powder, baking soda, and salt. Set aside.
In a separate large bowl, whisk together butter, brown sugar and molasses until combined, about 1 minute. Add egg and whisk to combine, another minute. Mix in milk and yogurt. Stir until all ingredients are incorporated.2
Add flour mixture to the wet ingredients and stir just until combined. Avoid over mixing.
Using a spoon, pour batter into donut tins. The tins will be full.
Bake for about 13 to 15 minutes, or until donut springs back when lightly touched.
Ginger Cinnamon Sugar
In a wide, shallow dish, whisk together the granulated sugar, cinnamon, and ginger.
Dip the tops and bottoms of warm donuts into the melted butter, then immediately into the spiced sugar mixture. Serve immediately.
Notes
The donut pans I used had cavities 3.25 inches in diameter.
You may see tiny bits of yogurt in the batter. That is okay. Avoid over mixing the batter.