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Preheat oven to 350 degrees.
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Heat oil in a large saute pan over medium heat. Add zucchini, pepper, mushrooms, garlic paste, and 1/4 teaspoon red pepper flakes. Cook until vegetable are just softened, about 5 minutes. Season to taste with salt and pepper. Set aside to cool.
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Put eggs, thyme, ground meat, ground oatmeal or bread crumbs, cheese, 1/2 cup ketchup, 2 tablespoons balsamic vinegar, and cooled vegetables in a large bowl and mix until just combined.
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Mold meatloaf into a loaf shape on a parchment paper lined baking sheet. Whisk together remaining 1/2 cup ketchup, 1/4 cup balsamic vinegar, and 1/4 teaspoon red pepper flakes. Brush mixture on top and sides of meatloaf. Bake for about 1 hour, depending on how thick the meatloaf is. If meatloaf is browning too quickly, turn oven down to 325. Let meatloaf rest for 10 before slicing.