Preheat your oven to 350°F (175°C) to ensure the meatloaf cooks evenly.

In a large skillet over medium heat, melt 2 tablespoons of unsalted butter. Add finely chopped onions and celery, sautéing for about 10-15 minutes until soft.

Stir in minced garlic and dried thyme, cooking until fragrant for 1-2 minutes, then remove from heat.

In a mixing bowl, beat 2 large eggs with ½ cup whole milk until well combined. If using gelatin, sprinkle it over the milk mixture and let it bloom for about 5 minutes.

Add the cooled onion mixture to your egg and milk blend. Incorporate ground beef, ground pork, kosher salt, black pepper, and ground saltines, mixing gently.

In a small bowl, mix together ½ cup ketchup and 2 tablespoons brown sugar until smooth.

Lightly grease a loaf pan. Layer half of the meat mixture into the pan, spread half of the glaze on top, then add the remaining meat mixture and finish with the rest of the glaze.

Bake the meatloaf in the preheated oven for 40-50 minutes, checking for an internal temperature of 155°F (68°C).

Switch to broil and let the meatloaf broil for an additional 2-3 minutes for caramelization.

Allow the meatloaf to rest for 15 minutes before slicing and serving with your favorite sides.