Been briefly playing around with making some high protein, low carb muffins and here what I have so far.
1 cup soy flour
1 cup protein powder (I used a 70 pea/30 rice mix)
0.5 cup rolled oats
2 tsp baking powder
0.5 cup raisins
1 tsp sea salt
2 tsp cinnamon
0.5 cup Unsweetened applesauce
2 cups water
Mix dry ingredients together, then add wet ingredients and mix well. Don't need to follow "the muffin method" since there's no gluten.
Put into a 12 muffin pan and bake for 30 minutes at 350 F.
These are a little crumbly but hold together much better than earlier versions. Still working on them.
The protein powder I used was vanilla flavored and stevia sweetened, but not strongly. You may need to adjust flavors. If you've never worked with soy flour before be aware that it has a tangy metallic flavor when raw in the batter, but this completely goes away once cooked.
Per muffin: 96 calories: 2g fat, 12g carbs (2g fiber, 6g sugar), 9g protein
More detail: http://www.nutritiondata.com/facts/recipe/1545883/2