In a medium skillet, heat oil over medium-high heat. Add beef; cook until browned and crumbly. (Drain if necessary.) Add pizza sauce, onion powder, and salt, stirring until combined. Transfer mixture to a medium bowl and let cool for 30 minutes.
Add cheese to cooled beef mixture, stirring until incorporated.
Preheat oven to 425°. Line a large rimmed baking sheet with parchment paper.
On a lightly floured surface, unroll dough. Using a 3½-inch round cutter, cut 16 dough circles, rerolling scraps as necessary. Spoon approximately 1 tablespoon beef mixture onto bottom half of each dough circle. Lightly brush edge of dough with water. Fold dough over. Crimp edges of dough with a fork dipped in flour. Place turnovers 1 inch apart on prepared baking sheet.
In a small bowl, whisk together egg and 1 teaspoon water. Brush tops of turnovers with egg mixture. Using a fork, pierce tops of turnovers.
Bake until turnovers are golden brown, approximately 13 minutes. Let cool on a wire cooling rack for approximately 10 minutes. Serve warm.
Recipe by TeaTime Magazine at https://teatimemagazine.com/cheesy-beef-pizza-turnovers-recipe/