Cook breakfast sausage until no longer pink.
Heat a separate pan over medium high heat. Add 2 Tbsp butter and allow to mostly melt. Make sure the butter coats the pan and up the sides. Pour in beaten eggs and use a spatula to gently push the eggs around the pan until completely set but still shiny.
To fry corn tortillas, coat a small pan with about 2 Tbps vegetable oil. Allow to get sizzling hot, quickly fry tortilla on each side and fold while still warm.
To assemble- fill a corn tortilla shell with approximately 2 Tbsp each ground sausage and scrambled eggs. Top with about 2 tsp queso fresco about 1 Tbsp diced tomatoes and a little bit of cilantro.