Preheat oven to 350°F and line a 9x13-inch baking pan with parchment or coat with nonstick spray.

In a small saucepan, combine peanut butter and honey. Heat over medium just until peanut butter is melted; whisk to blend.

Remove from heat and whisk in egg, butter, and vanilla until smooth.

In a large bowl, combine oats, brown sugar, and sea salt. Pour peanut butter mixture over the oats and stir well using a rubber spatula. Stir until no dry oats remain. Fold in peanut butter chips.

Scoop mixture into the prepared pan and press firmly and evenly to the edges. Bake for 12-15 minutes. Let cool completely before slicing into bars.