MEAT SAUCE -- Heat the oil, then crumble the hamburger in the pan until it is evenly browned. Make the chunks as large or as small as you prefer. Add chili powder, salt, pepper, tomato paste, garlic, the herbs and enough water to almost drown the meat. Stir briskly to break up the tomato paste, heat to med-high and allow to reduce a little until it's nice and thick. (takes about 20 minutes and basically trashes the stove, but oh well).
WHITE (CHEESEY) SAUCE -- Empty can of white sauce into small pot, adding some milk if it's too thick, and heat slowly and gently, stirring constantly. Stir in the cup of shredded cheese.
ASSEMBLY -- Oil a baking dish. Preheat oven to 350°F Start with a dollop of meat sauce on the bottom. Then place sheets of lasagna side by side (how many depends on how big your baking dish is -- ours holds two sheets next to each other nicely), 1/3rd of the can of white sauce, a portion of the meat sauce, and lots of shredded cheese.
Repeat this twice more -- lasagna, white sauce, meat sauce and cheese…. lasagna, white sauce, meat sauce and cheese.
Put into oven, bake for 25-30 minutes. If the cheese on top isn't crispy enough, broil the heck out of it for another 5 minutes or so. Prepare to have your arteries harden while-u-wait.