I don't know about the "McGrok" but I follow a recipe for a bread using almond flour that would be perfect for making a breakfast sandwich.
1/4 cup almond flour
1 TBSP butter, melted
1 tsp. baking powder
dash of salt
Mix and then put into buttered ramekin or small bowl. Microwave for 1 minute 20 seconds. Remove and slice.
A three inch ramekin is about the perfect sammich size. It makes enough for two sandwiches for me but slice it think and only use it as a vehicle for what I'm putting in it. I love it and so does my 8 year old. He's a bread fanatic and hates that I don't keep it in the house but this works for him. Good luck!