For the batter:

3 tbsp spelt flour (or white. For gf: a commenter had success with 1 tbsp rice flour and 2 tbsp almond flour.)
1/4 tsp baking powder
1/16 tsp salt
1 stevia packet (or 1/32 tsp pure) or 1 tbsp sugar
1 tablespoon plus 2 tsp water
2 tsp oil or melted margarine or applesauce (I prefer the oil/margarine, but that’s simply because I’m not a fan of fat-free baked goods.)
1/4 tsp pure vanilla extract

For the streusel: (If you like a lot of streusel, feel free to double all ingredients below.)

1/8 tsp cinnamon
1 and 1/4 tsp sucanat or brown sugar
1/4 to 1/2 tsp oil or melted margarine (once again, use applesauce if a fat-free version is desired)
tiny, tiny pinch salt
2 pecan halves (or walnut halves)