Preheat oven to 400 F. Line a baking sheet with parchment paper and set aside.

Combine dry ingredients {first 5} in a mixing bowl, reserving the 1 tablespoon of flour for later. Carefully grate frozen butter into flour mixture using the large holes of a box grater. Toss the mixture thoroughly to combine until it resembles a coarse meal {use a pastry cutter or two forks for this, not your warm fingers or they will melt the butter}.

In a separate bowl, whisk sour cream and egg together until smooth. Combine wet and dry ingredients and gently mix. In a separate bowl combine remaining flour, jalapenos, thyme, pepper and the cheese; gently mix again until large dough clumps form. Work the dough with your hands until a ball forms {be patient here because it might take awhile to form, but trust me it does come together}.

Press ball onto a floured surface, pushing down until a circle about 8 inches is formed {the dough should be about 3/4 – 1 inch thick}. Cut into 8 triangles. Place the triangles onto the prepared baking sheet about 1 inch apart. Bake about 18- 20 minutes or until golden. Serve warm.