Brush both sides of the slices of sourdough with 2 tablespoons of olive oil. Using a hot skillet or grill, toast the bread on both sides until lightly charred on the edges, 2 to 3 minutes per side. Alternatively, you can use a toaster, toaster oven, or broiler.
Allow the bread to toast as long as possible without burning. This will allow it to hold the bruschetta mixture without soaking up as much juice.