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Platter of steak crostini appetizers featuring seared beef and herb butter on toasted baguette slices.

Garlic Herb Steak Crostini Easy Flavorful Party Appetizer

Elevate your next gathering with these irresistible steak crostini! Tender, perfectly seared garlic-herb marinated steak slices atop crispy baguette, spread with a savory cream cheese blend, creating a sophisticated yet easy-to-make party bite.
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Prep Time 30 minutes
Cook Time 15 minutes
Total Time 45 minutes
Servings: 24 pieces
Course: Appetizer, Party Food
Cuisine: American, Fusion
Calories: 120
Ingredients Equipment Method Notes

Ingredients
  

For the Garlic Herb Steak
  • 1 lb sirloin steak 1-inch thick, room temperature
  • 2 tbsp olive oil for marinating
  • 4 cloves garlic minced
  • 1 tbsp fresh rosemary finely chopped
  • 1 tbsp fresh thyme finely chopped
  • 1/2 tsp black pepper freshly ground
  • 1/4 tsp red pepper flakes optional
  • 1/2 tsp sea salt plus more for searing
  • 1 tbsp olive oil for searing
  • 1 tbsp unsalted butter
For the Crostini
  • 1 baguette fresh, about 16-inch long
  • 2 tbsp extra virgin olive oil
  • 1/2 tsp garlic powder
  • 1/4 tsp salt
For the Garlic Herb Cream Cheese Spread
  • 4 oz cream cheese softened, full-fat
  • 2 tbsp fresh chives finely chopped
  • 1 clove garlic minced, small
  • 1 tbsp fresh parsley finely chopped
  • 1 tbsp mayonnaise
  • 1/8 tsp black pepper
  • Pinch salt
For Garnish
  • 2 tbsp fresh chives finely chopped

Equipment

  • Large Mixing Bowl
  • Whisk
  • Cutting Board
  • Sharp Knife
  • Large Cast Iron Skillet
  • Baking Sheet
  • Small Mixing Bowl
  • Tongs
  • Pastry Brush

Method
 

Prepare the Steak Marinade
  1. Pat the sirloin steak dry thoroughly with paper towels.
  2. In a large bowl, whisk together 2 tablespoons olive oil, minced garlic, chopped rosemary, chopped thyme, black pepper, red pepper flakes (if using), and 1/2 teaspoon sea salt.
  3. Add the steak to the marinade, ensuring it's fully coated. Cover and let marinate at room temperature for at least 30 minutes, or refrigerate for up to 2 hours. If refrigerating, bring to room temperature for 15-20 minutes before cooking.
Cook the Steak
  1. Heat 1 tablespoon olive oil in a large cast-iron skillet over medium-high heat until shimmering and almost smoking.
  2. Carefully place the marinated steak in the hot skillet. Sear for 3-4 minutes per side for medium-rare (internal temperature 130-135°F / 54-57°C). For the last minute of cooking, add the unsalted butter to the pan and spoon the melted butter over the steak.
  3. Remove steak from skillet and transfer to a cutting board. Tent loosely with foil and let rest for 5-10 minutes. This is crucial for juicy steak.
Prepare the Crostini
  1. Preheat oven to 375°F (190°C).
  2. Slice the baguette into 1/2-inch thick rounds (approximately 24 slices).
  3. Arrange the baguette slices in a single layer on a baking sheet.
  4. In a small bowl, whisk together 2 tablespoons extra virgin olive oil, garlic powder, and 1/4 teaspoon salt. Brush both sides of the baguette slices with this mixture.
  5. Bake for 8-12 minutes, flipping halfway through, until golden brown and crispy. Let cool completely on a wire rack.
Make the Garlic Herb Cream Cheese Spread
  1. In a small mixing bowl, combine the softened cream cheese, chopped chives, minced garlic, chopped parsley, mayonnaise, 1/8 teaspoon black pepper, and a pinch of salt.
  2. Mix until well combined and smooth. Taste and adjust seasoning if needed.
Assemble the Crostini
  1. Thinly slice the rested steak against the grain into bite-sized pieces or small strips.
  2. Spread a generous layer of the garlic herb cream cheese mixture onto each cooled crostini.
  3. Top each crostini with a slice or two of the seared steak.
  4. Garnish with extra finely chopped fresh chives just before serving.
Serve
  1. Arrange on a platter and serve immediately.

Notes

Make Ahead: The cream cheese spread can be made a day in advance and stored in an airtight container in the refrigerator. The crostini can also be baked a day ahead and stored at room temperature in an airtight container. Cook and slice the steak just before assembling for best results.
Steak Doneness: Adjust searing time based on your preferred doneness. Use a meat thermometer for accuracy.
Variations: For a touch of sweetness, add a drizzle of balsamic glaze over the assembled crostini. A thin slice of roasted red pepper can also be a nice addition.