Combine feta, olive oil, lemon juice, and pine nuts in a medium bowl. Stir with a fork until it is well blended. Add salt and peppers to taste.
Lay out slices of bread on a cookie sheet. Spoon a heaping tablespoon of the feta mixture onto a baguette slice and place on the cookie sheet. Once all baguette slices are topped with the cheese mixture, place in oven for approximately ten minutes (the bread should get warm and toasted but the cheese shouldn't be burnt).
Remove from oven and top with the sliced cucumbers. Serve immediately.
Recipe by Lesleigh Kowalski Frank at https://www.lesleighfrank.com/2015/08/04/easy-summer-appetizer-feta-cucumber-toasts/