Pre-heat oven to 350 degrees.
In a large bowl, whisk together flour, baking soda, chili powder, and salt.
Gently stir in melted butter, eggs, and buttermilk.
Fold kale and cheddar cheese into mixture until combined.
Lightly spray a doughnut pan with cooking oil. Evenly distribute batter into pan, filling cavities almost all the way.
Bake the doughnuts at 350 degrees for about 11-13 minutes, until doughnuts are starting to turn golden around edges and lightly spring back when touched.
Let cool in pan for 5 minutes before removing to a wire rack to cool completely.
In small skillet sprayed with cooking oil, cook eggs sunny-side up.
Put slice of prosciutto and one egg on a doughnut and top with another.