In a large skillet over medium-high heat, cook the ground beef and diced onion until the beef is mostly browned and the onion is softened, about 3-5 minutes.
1 pound ground beef, 1 medium onion
Stir in the ketchup, mustard, and condensed chicken gumbo soup.
¼ cup ketchup, 2 tablespoons yellow mustard, 1 can condensed chicken gumbo soup
Reduce heat to medium and simmer uncovered for 10-15 minutes, stirring occasionally, until thickened.
While the mixture simmers, toast the hamburger buns in a skillet or under the broiler. Watch carefully to prevent burning.
6 hamburger buns
Spoon the mixture onto toasted buns and serve immediately.
Notes
🥡 STORAGE
Store leftover filling in an airtight container in the refrigerator for up to 5 days
♨️ REHEATING
Microwave - heat in 30-second intervals, stirring between each
Stovetop - warm over medium-low heat until heated through
Oven - reheat covered at 300° until warm
❄️ FREEZING
Freeze the cooled filling in a freezer-safe bag for up to 2 months
Thaw overnight in the refrigerator before reheating
💡 TIPS FOR BEST RESULTS
Use lean ground beef to reduce grease
Simmer uncovered to thicken properly
Toast buns to prevent soggy sandwiches
🍳 ALTERNATE COOKING METHODS
Slow cooker - brown meat first, then cook on low for 2-3 hours
Instant pot - sauté beef, then simmer using sauté mode
♻️ LEFTOVERS
Use as a topping for baked potatoes
Serve over rice for a quick meal
Add to pasta for a sloppy joe twist
📝 NOTES
If using higher-fat beef, drain excess grease after browning