Heat oven to 350ºF (180ºC). Dip one side of the baguette slices into the oil and place on a baking sheet with the oil-dipped side facing up. Repeat with the remaining slices.
Bake until crisp, about 15 minutes. Remove and let cool.
Heat oven to 400ºF (200ºC). Add marinara sauce to the bottom of an 8” x 5½” baking dish.
Flatten the goat cheese log into a circle then add to the baking dish on top of the sauce.
Bake until the goat cheese is melty and the sauce is bubbling, about 15 to 20 minutes.
Season with salt and pepper, then garnish with basil and serve with the crostini.