In a pan over medium heat, add a little cooking oil and heat up for a minute or two. Then add in the diced onions. Saute for 6 - 8 minutes or until softened and translucent. Add in the garlic and cook for 1 minute. Remove from heat and set aside and let cool.
Combine Breadcrumbs and Plant Milk in a bowl, stir to combine. Set aside for 5 minutes.
Once onions and garlic have cooled, and breadcrumbs are moistened, add everything for the meatloaf to a mixing bowl and combine with clean hands. Once meat is well combined, cover and refrigerate for 30 minutes.
While meatloaf mixture chills, combine ingredients for the glaze. Set aside for later.
Preheat oven to 350 F / 176 C.
Shape the meatloaf mixture into a loaf. Pack it but not too tightly (unless you like a really dense meatloaf!) Add the meatloaf to a parchment lined baking sheet.
Brush or spread on half of the ketchup glaze on top of the meatloaf. Bake at 350 F / 176 C for 30 minutes. Then remove from the oven, and brush on the other half of the glaze. Bake for another 30 minutes or until the internal temperature is 160 F / 70 C.
Let the meatloaf cool (ideally on a cooling rack) for 10 minutes, then slice and serve how you like!
Store leftovers in an airtight container in the fridge for 3 - 5 days. Make sure you make Meatloaf Sandwiches with them!