Preheat your oven to 375°
Rinse your salmon and pat dry with paper towels.
Line your sheet pan with a large enough piece of foil to completely wrap around your fillet and lightly coat it with oil
Cut one of your lemons up into thin slices and arrange half of them down the middle of your pan along with the sprigs of dill. Cut the other lemon into wedges for serving later.
Place your salmon down on top of the lemon slices and dill. Lightly coat with oil and sprinkle with the salt and pepper. Sprinkle the chopped garlic over the top and arrange the other half of the lemon slices across your fish.
Tent your foil around your fillet and seal. If your foil is small, you may need to use a second piece. The goal is to create a small tent around your salmon.
Put your salmon in the oven and bake for ~15 minutes then remove from oven.
Switch your oven to broil, open your foil up to completely expose your salmon.
Put your salmon back in the oven to finish, just browning the top and caramelizing the garlic, about 3 minutes. Be very careful not to overcook your fish. If it is still not quite done, close the tent and let it rest for a few minutes off the heat.
Portion and serve immediately.