Combine 1 cup flour, baking soda and salt in a medium bowl and whisk to mix well. Set aside. Combine butter and sugar in a large bowl and beat at medium speed with a mixer about 2 minutes, or until light and fluffy. Beat in egg, sour cream and vanilla. Beat in melted chocolate. Add flour mixture and beat at low speed just until well combined. Toss cherries with remaining 1 tablespoon flour and gently stir into batter. Spoon batter into prepared cups.