Preheat oven to 350°F (176°C). Line an 8-inch baking dish with nonstick foil or parchment paper.
Combine eggs, peanut butter, dates, banana and vanilla in a mixing bowl. Use a hand mixer to combine until well blended. Stir in oats, baking powder and salt. Fold in chocolate chunks and nuts.
Press mixture into prepared pan. Bake 18–20 minutes, until edges are lightly browned. Cool in pan for 10 minutes; lift up foil or parchment, and cool on wire rack. Cut into 10 bars.
