Line two cookie sheets with parchment paper.
Take the fathead dough and divide it in half, then divide each half into thirds.
Press out three balls of dough into 6-7" circles on one of the cookie sheets. Using a slotted spoon to drain any remaining liquid, put approximately 1/2 cup of the beef filling on one half of the circles, then fold the other half over the top to make a half-circle shape.
Spray the back of the tines of a fork with cooking spray, and press it around the rounded edge of the circle to crimp and seal it shut. Repeat with the remaining two circles, adding more cooking spray if the fork sticks. Prick the top of each sandwich four times with the fork, then bake for 12-15 minutes, until golden brown.
While the first three bake, repeat with the remaining three balls of dough on the second cookie sheet. Remove the first sheet from the oven and put the cooked runzas on a cooling rack or in a warmer if you plan to serve them immediately. Let the first cookie sheet cool while the second one cooks.
Use the rest of the ingredients to make the remaining fathead dough while the second cookie sheet is in the oven. Using the above instructions, assemble the next three sandwiches on a sheet of parchment paper on the counter, then carefully move it to the cooled cookie sheet. Repeat again for the remaining 3 sandwiches.
Macros per serving: 504 calories, 6 grams net carbs, 37 grams protein, 35 grams fat.