1. Heat oven to 375 degrees F. Brush both sides of baguette slices with 1/4 cup oil and place on a baking sheet. Bake toasts until golden brown, 10 to 15 min. (Tip: You can make the toasts up to 3 days ahead to save time on the day of your get-together. After baking, cool and store them in an airtight container.)
2. Place flour in a shallow dish, eggs in a second shallow dish and bread crumbs in a third shallow dish. Dredge chicken in flour, shaking off excess. Dip in eggs and then in bread crumbs. Warm remaining 1/4 cup oil in a skillet over medium-high heat. Cook chicken until done, 4 to 5 min per side.
3. Place chicken on a baking sheet and top each piece with a small slice of provolone. Bake until cheese melts, 4 to 5 min. Top crostini with a piece of chicken, marinara and parsley; serve warm.