Step 1

Preheat the oven to 350 degrees F.

Step 2

Coat a 2-quart casserole dish with cooking spray.

Step 3

In a large skillet over medium heat, heat the oil.

Step 4

Add the onion to the hot oil and cook until softened, about 5 minutes.

Step 5

Add the beef and cook, while crumbling the meat, until completely browned, about 7-10 minutes.

Step 6

In a large bowl, add the beef mixture along with the beans, the tomatoes, the brown sugar, the Dijon mustard, the salt, and the pepper, mixing well to combine.

Step 7

Pour the beef mixture into the prepared casserole dish and arrange the bacon slices on top.

Step 8

Cover the casserole dish with a lid or aluminum foil.

Step 9

Bake until thick and bubbly, about 45 minutes.

Step 10

Uncover the dish and preheat the broiler.

Step 11

Broil until the bacon is crisp, about 1-2 minutes.

Step 12

Serve.