Step 1: Preheat your oven to 375 °F (190 °C). Line a baking sheet with parchment paper.
Step 2: In a skillet over medium heat, cook the chopped turkey bacon until crisp, about 4 minutes. Transfer to a paper-towel–lined plate to drain.
Step 3: In the same skillet, add the diced onion and minced garlic (for filling). Cook for 2–3 minutes until the onion is translucent and garlic is fragrant.
Step 4: Return the skillet to medium-high heat. Add the ground beef, season with salt and pepper, and cook until no pink remains, about 5–6 minutes. Drain any excess fat.
Step 5: Stir in the ketchup, mustard, and dill pickle relish. Cook for 1 more minute, then remove from heat. Fold in the crisped turkey bacon and ½ cup of the shredded cheddar.
Step 6: On a clean, lightly floured surface, unroll the crescent roll dough into a single 9×12-inch rectangle, pressing perforations to seal.
Step 7: Spread the beef-bacon-cheese mixture down the long edge of the dough, leaving a ½-inch border. Sprinkle the remaining ½ cup cheddar over the filling. Tightly roll the dough away from you, seam side down.
Step 8: Using a sharp knife, cut the log into eight equal pieces. Place each piece cut-side down on the prepared baking sheet, about 1 inch apart.
Step 9: In a small bowl, combine the melted butter, minced garlic (for butter), and chopped parsley. Generously brush the tops and sides of each roll-up.
Step 10: Bake in the preheated 375 °F (190 °C) oven for 15–18 minutes, or until the crescent dough is puffed, golden-brown, and the cheese is melted.
Step 11: Remove from the oven and let rest for 2 minutes. Serve warm, with optional extra ketchup, mustard, or pickle slices.