Preheat the oven to 350˚ F. Lightly coat an 8-inch square baking dish with cooking spray. Whisk the eggs, half-and-half and 1/2 teaspoon salt in a medium bowl. Pour into the pan and bake until puffed and set, 16 to 18 minutes. Let cool slightly.
Meanwhile, heat a large skillet over medium heat and coat with cooking spray. Add the Canadian bacon and cook, flipping, until browned, about 1 minute per side. Remove to a cutting board and cut each slice into 4 pieces.
Spread the butter on the cut sides of the rolls. Slice the baked eggs into 12 small pieces and lift out of the pan with a spatula; place one on each roll bottom. Top each with a piece of cheese, 2 pieces Canadian bacon and the roll tops. Thread strawberries and grapes onto skewers and serve with the sliders.
Stash these sliders in the freezer for a quick weekday breakfast! Wrap individually in foil and freeze for up to 3 months. To reheat, remove the foil, wrap the sandwich in a paper towel and microwave until hot.